Never bring your work home with you -- especially if your job involves ghost-hunting and human skulls -- because you could end up with one pissed-off spirit haunting your house ... and pushing your friends down stairs.
"Ghost Adventures" star Zak Bagans tells TMZ, the supernatural encounters began after he found a human skull during an investigation last month at an old mining town hotel -- and genius actually decided to bring the remains home with him.
Zak -- who built a display for the skull in the basement of his Las Vegas home -- tells us, he noticed a huge surge in paranormal activity almost instantly ... an angry, demonic-type presence that had never been in his house before.
On one night, Zak tells us, he was woken up by a slight pressure on his ankles -- what felt like hands grabbing him -- and all of a sudden, the force yanked him several inches down in his bed.
Days later, Zak says he had a girl over at his house -- and out of nowhere, she spilled head over heels down his stairs ... insisting someone ... or something ... had pushed her.
But that's just the tip of the iceberg -- and Zak tells us, he's so terrified ... he hired a local bishop to perform an exorcism at his house in the next two weeks
Zak adds, "I love my job, but i want to feel safe in my house. I don't feel safe." Word to the wise -- don't jack human skulls and bring them into your house.
