Mike Tyson Steel Cage Showdown On L.A. Beach ... Still Ripped

BEAST MODE
BACKGRID

Here's "Iron" Mike Tyson tossing a steel cage around an L.A. beach this week like it's a toy ... and it's pretty fun to watch!!

Unclear why Mike hit the sand ... but it's all obviously part of a larger production -- hence the video cameras and crew members (all of whom were wearing masks btw, so props on that!).

In addition to the cage flip, Tyson was also spotted carrying buckets of bloody fish, tossing life rafts and wearing snorkeling equipment.

It almost seems like a promo for Shark Week.

Tyson just turned 54 years old this week ... and has said he wants to get back in the ring for some exhibition boxing matches -- but so far, nothing's a done deal.

The boxing legend told us he'd even be down to take on his old rival Evander Holyfield (who's also training for a comeback) but only if they could raise a bunch of money for charity.

"That would be awesome for charity," Tyson told us back in May ... "Can you imagine me and him going in the ring together?"

Tyson is also the focus of an upcoming movie -- with Jamie Foxx playing the boxer ... and he's already transforming his body into fighting shape.

IRON FOXX
@markbirnbaum / Instagram

'Shark Week' Did You Know ... Sharks Have 2 Penises?!?

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SHARK ENVY
Discovery

Here's a fun fact Mike Myers will love ... male sharks have 2 PENISES ... count 'em, TWO!!!

Yes, it's a true scientific fact male sharks are blessed with two members ... and the reasons behind the double dongs are gonna be explored by Discovery Channel when "Shark Week" returns next month.

To get us ready for "Shark Week" and the two-penis episode, Discovery's coming in hot with this hilarious ad ... and ya gotta check it out, because it's straight outta Mike's playbook.

If you've ever seen "Austin Powers: The Spy Who Shagged Me," the shark penis jokes should ring a bell ... and they're still funny, even 21 years later.

Quick science lesson ... male sharks have 2 penises, which are really just 2 grooved organs used to deposit sperm in the genital ducts of a sexually receptive female shark.

The organs are developed alongside the inner part of the shark's pelvic fin, and because there are 2 pelvic fins, there are 2 penises. Oh, and they only use one at a time.

Shark Week runs from Sunday, August 9-16 with more than 20 hours of shark programming through the week. The event will take viewers to oceans around the world to learn about the awesome creatures.

And, if the penis teaser is any hint, Discovery's right ... there's still A LOT you don't know.

Michael Phelps Tells Shark Race Haters ... Bite Me!!!

NOT MY FAULT!

Michael Phelps isn't taking a shred of blame for viewers' disappointment over him not racing an actual great white shark, and says he stands by the "incredible" made-for-TV event.

The 23-time Olympic gold medal winner opened himself up to his critics on Facebook and addressed the backlash from his Discovery Channel special. You'll recall, no doubt, Phelps lost to the shark ... but it was a CGI shark.

Phelps claims everyone involved in the man vs. beast production made it very clear what the "race" would entail, but people chose not to listen and now they're hatin' ... which he calls "shocking."

Speaking of shocking -- Michael didn't race a real shark, but REALLY did swim in 53 degree water!

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