Salmon Glitch
The Salmon Glitch (official name pending) is a glitch in Chip's Challenge 2 in which Chip and Melinda can sometimes push a block while sliding across a row of force floors regardless of where the force floors are actually pointing.
Helmet variant
A demonstration can be found here.
Hook variant
The main difference from the helmet variant, aside from the item needed, is that the player needs to be on the opposite side of the block.