Super Mario 64 Glitches

Headless Mario in the Roof (Big Boo's Haunt)
Go to the Big Boo's Haunt stage and enter the shed. Go down the elevator and get off. Get back on, go up, and just before the elevator gets to the top, when the opening is about to Mario's head, run into the wall/roof. Keep trying to push against it, and Mario will stay there, head missing, pushing against a wall that isn't there, and stuck in the roof. He will sound like he is walking in water. Stop pushing to drop.