Shortcut through the stairway

From Glitches

From the game Super Mario 64 for the Nintendo 64.

Go to the first stairwell, that leads from the main floor to the upper floor. Stand a bit aways from the brick wall to the right of the stairs, before going on the stairs. Now, do a sideways flip into the wall. If done correctly, you will bash into the wall but then hold onto the top and pull yourself through the ceiling. You will end up at the top of the stairs. What a useless shortcut.