Go through some walls

From Glitches

From the game Super Mario 64 for the Nintendo 64.

Shoot yourself on top of Peach's castle with the cannon by the lake. Now, travel to the back and try running at some of the spires that stick up from the corners of the castle roof. You'll be able to go through two of them like they don't exist... unfortunately, there is flooring underneath for some reason.

Submitted by: WSB