Nurse!

A Disney roller coaster ride became unhinged and a visitor, who was on the sidelines minding her own business, got knocked out by a bolt out of the sky ... literally.

Tatjana Goodall claims in a new lawsuit she was sitting on a park bench enjoying a cool drink when an errant bolt that had just flown off the California Screamin' roller coaster nailed her in the head, knocking her off the bench and rendering her unconscious.

Goodall claims she began vomiting, but the nurse at Disney California Adventure assured her the only worrisome sign would be if it was projectile vomiting, and she had the regular kind.

Goodall says she was diagnosed with traumatic brain injury, and she says there's permanent damage.

According to the lawsuit, the ride was shut down immediately after the incident.

SoulCycle's crappy instructors and faulty bikes are to blame for a catastrophic ankle injury ... so claims a very disgruntled customer.

Carmen Farias claims in a new lawsuit she showed up to spin class in 2014 and, since she was a newbie, she expected someone would show her how to use the bikes. Farias says she started riding but quickly tired and the instructor barked, "We don't take breaks."

Farias says she was so embarrassed she soldiered on, as her feet were locked to the pedals. She says she became so fatigued she fell off the bike with her feet still strapped in ... but the momentum of the fly wheel kept the pedals turning, and each rotation caused ankle dislocation.

She blames the bikes and lack of instruction for what she claims are catastrophic ankle injuries.

4:00 PM PT -- Mokrani doesn't know what the hell Chris is talking about ... he tells us he was NOT working security at the club.

8:55 AM PT - Chris Brown posted on social media and said Mokrani was a security guard who assaulted him and tried to kick him out, so his team "handled the situation accordingly."

Chris Brown exploded in anger and stomped on a man's head during a concert ... and the victim is now gunning for some justice.

Malek Mokrani attended a Brown concert in Cannes on May 18 ... it's clear a fight erupted and something clearly upset Chris, because you see his shoe turn into a weapon.

It's unclear if Mokrani was involved in the fight or just collateral damage.

He tells us he went to the hospital with neck and head pain and plans on filing a police report.

We reached out to Brown's rep. So far no word back.

Laila Ali is thanking the fans for the love and support after her father was hospitalized this week ... but did not provide any health updates.

"Thank for all the love and well wishes. I feel your love and appreciate it," Laila posted on Facebook.

She also posted a pic of Muhammad Ali with her daughter, Sydney, and added, "I love this photo of my father and my daughter Sydney when she was a baby!"

Andrew Kornfeld, the man who called 911 when Prince died, firmly believes he could have saved the singer with the backpack full of opioids he had at Paisley Park that morning.

The ME's report revelation that Prince died from a self-administered dose of Fentanyl ... seems to acquit Kornfeld and his father, Dr. Howard Kornfeld, of any involvement in the death. Andrew was delivering an opioid called Buprenorphine to treat Prince's addiction to Percocet. He insists Prince never took the drug.

Now Kornfeld is singing the praises of the synthetic opiate, saying it should be more accessible to addiction patients everywhere. Kornfeld tells CNN, he believes part of Prince's problem was that Buprenorphine is very difficult to get in Minnesota.

Muhammad Ali has been hospitalized for a respiratory issue ... and he's currently in fair condition, this according to the boxer's spokesperson.

Mariah Carey is living proof the show must and will go on ... even if she gets knocked semi-senseless.

Mariah was leaving Mr Chow, talking her prized Marilyn Monroe piano, when she slammed her head on her SUV.

It's a pretty intense hit, but she powers through ...

One of the "Sons of Anarchy" and a 'Teenage Mutant Ninja Turtle' teamed up for a real life rescue mission -- pulling a guy from an overturned car ... TMZ has learned.

'SOA' star Tommy Flanagan and Alan Ritchson -- Raphael from the latest 'TMNT' movie -- were headed to the Houston airport on Sunday after a comic con event ... when they saw a truck blow a tire and flip across the highway.

The driver of the wrecked truck, Jonathan Elder, tells us the actors rushed to pull his unconscious brother out of the passenger seat. In a scene straight out of an action flick ... he says 'Raphael' and 'Chibs' used a crowbar to free his bro right before the truck caught fire.

BTW ... the guy driving Tommy and Alan to the airport is a military vet who provided medical assistance until emergency crews arrived. Tommy took a pic with him after the incident.

Talk about a dream team.

Calvin Harris -- it seems -- has at least one lingering injury from his car accident ... just check out his bum ear.

Calvin arrived at LAX Tuesday with a bruised and misshapen right lobe.

TMZ broke the story ... Calvin was in a terrible car crash May 20 and taken by ambulance to the hospital, but bailed against doctor's advice when he couldn't get a private room. His people told us he left because his only injury was a small cut on his nose, but that doesn't appear to be the case.

Taylor Swift's BF had flown to London, though it's unclear why. He's already cancelled 4 gigs.

Forget the Olympics, the Zika virus has already infiltrated MLB -- with Detroit Tigers pitcher Francisco Rodriguez saying he contracted the virus in Venezuela during the offseason.

The 34-year-old revealed his health status to ESPN -- saying his symptoms started off almost like a common cold ... but quickly escalated.

"It wasn't a cold. A cold, you have a sneeze, have a headache, take a couple Tylenol and you're done. You don't have a cold for two weeks, you don't have a bodyache for two weeks, you don't have headaches, throwing up, weaknesses for two weeks."

Rodriguez says he was bedridden for 2 weeks while he fought off the mosquito-borne virus -- which some experts say can cause severe birth defects and neurological issues in adults.

He also says it took him roughly 2 months before he started to feel normal again -- and notes that he was never considered contagious.

As for Olympic athletes worried about catching Zika in Brazil -- Rodriguez says the concern is real.

Dressing up as Donkey Kong was no monkey business for a guy who claims the poorly designed costume left him injured.

According to the lawsuit, obtained by TMZ, Nintendo of America hired Michael Oconitrillo to play the famous gorilla at a mall in Culver City, CA. He says even though the Kong suit was "poorly ventilated and unreasonably and dangerously hot" ... he had strict orders to keep it on.

It may sound like a typical Halloween, but Michael says he suffered permanent damage, as well as mental and emotional distress -- though he doesn't list any specific injuries.

Sports Illustrated model Tanya Mityushina and Carls Jr.hottie Kara Del Toro got wrecked on their way home from the Indy 500 ... TMZ has learned.

Indianapolis cops tell TMZ ... Tanya and Kara were in an SUV on Sunday after leaving the race when a Volkswagen Jetta t-boned their ride.

Two other passengers in the SUV were taken to the hospital by an ambulance ... while Kara and Tanya went back to their hotel -- but once there, Tanya complained of a headache.

Sources close to the models tell us they both went to the hospital where doctors told Tanya she had suffered a concussion. Kara was okay.

Tanya's out of the hospital, but still experiencing head and neck pain.

Marc Anthony makes a crummy ship captain -- so says a former employee who claims he lost a finger working on the singer's boat.

Jean-Pierre Perret says in a new lawsuit he was a member of the crew back in March 2015 on Anthony's yacht "Seas The Day." Perret says he was helping repair the boat's busted anchor when something went terribly wrong ... and a digit on his right hand went overboard.

Perret says it was Marc's responsibility to make sure the boat was shipshape. He says he was never warned the anchor could be so dangerous.

Amber Heard claims in legal docs ... during their entire relationship Johnny Depp was verbally and physically abusive, and she lays part of the blame on drug and alcohol abuse.

TMZ has obtained the legal docs Amber filed to support her claim that Johnny smashed an iPhone against her face Saturday night, which she claims triggered her move to file for divorce. As we reported, cops came but she declined to file a report.

Amber claims, before the alleged incident over the weekend -- during her birthday party at home last month ... Johnny showed up "inebriated and high." She says after the guests left, they argued and he threw a magnum-sized bottle of champagne at the wall and a wine glass at her. She says he grabbed her by the shoulders and pushed her onto the bed. She also says he grabbed her by the hair and shoved her to the floor.

Amber says she didn't see Johnny again for a month, until Saturday night. She says he was drunk and high again and they were talking about his mom's passing the day before. She says he "suddenly began obsessing" about something, got mad, grabbed the phone, "wound up his arm like a baseball pitcher and threw the cell phone at me striking my cheek and eye."

Cris 'Cyborg' Justino is usually the one drawing blood ... but the UFC star made an exception last week ... hitting up a Brazilian hospital to donate some of her own.

TMZ Sports has learned Cyborg visited Our Lady Of Grace Hospital in Curitiba (her hometown) ... and spent time hanging out with pediatric cancer patients and children with autism.

A spokesperson for the hospital says Justino "chatted and took pictures with our patients." She also "donated a pair of autographed gloves" ... and gave a pint of blood at the blood bank.

"The visit went great and our patients were really happy with the surprise."

Nyquist -- the winner of the Kentucky Derby -- has been pulled from the Belmont Stakes ... after complications with his health, TMZ Sports has learned.

We spoke with Nyquist's assistant trainer, Jack Sisterson, who tells us ... Nyquist has an elevated white blood cell count, which can sometimes indicate an infection.

Nyquist was already battling a fever -- but Sisterson hoped Nyquist would overcome it in time for the Belmont Stakes next month.

Now, with this new complication, Sisterson says it's better to play it safe -- and not push Nyquist too hard.

"We just want to do right by Nyquist right now. We want to make sure he'll be back to 100% in the next few days."

As for his future -- "He's definitely going to race again this summer."