Fall through the bridge

From Glitches

From the game Super Mario Sunshine for the Nintendo Gamecube

On the Pianta Village Level, at the beginning, there is a bridge. Squirt water on the ground and then slide onto the bridge so that you begin sliding very quickly (the technique where Mario briefly glows and then slides). If done correctly, you will go right through the bridge. It is easier to do this when sliding backwards, and it may take a couple of tries.

Submitted by: Aquanistic