Yoshi through pipes
From Glitches
From the game Super Mario World for the Super Nintendo
Go to a level with moving pipes, such as Chocolate Island 5, past the boxed holding items/enemies and the water. You should also be riding a Yoshi. Jump above a moving pipe and jump off of Yoshi (hit A). Jump to another pipe or area. Yoshi should fall onto the pipe and then move with it. When the pipe moves upwards, Yoshi gets shoved into the pipe, and when it moves downwards, Yoshi temporarily floats in the air and then falls.
Submitted by: Connie and kornyhatemachine