Messed up doors

From Glitches

From the game Super Mario 64 for the Nintendo 64.

This works on any one-sided door. Go through the door and then immediately turn backand run and punch at the door. Do this repeatedly, and often strange things will happen. Sometimes you'll punch through the door and end up inside of it. Any slight movement will make you move into the next room, though. Sometimes when you open the door, you'll end up "opening" air, because the animation gets animated when you're past the door. And, sometimes, you'll enter a room twice when you should be traveling to the room on the other side.