What's your favorite move from a platformer?

Namely ones that affect your movement in some way. Looking for ideas for my game. For example... two of mine would be, the dive from mario 64 and sun shine and the midair spin from the new super mario games. For the former, it's mostly because I remember having fun just jumping and diving repeatedly, keeping alot of speed. (Or at least it felt like.) with sun shine, it's cause slip n' sliding is just great. For the latter, while I do like how you sort of have to commit to your jumps in mario, but the midair spin adds some flexibility, as well as just a little breathing room, not quite the freedom that a full double jump allows you, makes each jump just a little more exciting in my opinion.