What warframe abilities do you find the most fun?

I don't mean fun as in roar or gloom is fun to put on a build because it's optimal. I mean fun as in it's a stupid ability you refuse to get rid of or subsume over because it's enjoyable to spam it.

I'll go first, my favorite is Mach Rush because i get to go Nyoom then headbutt a wall at Mach Fuck speeds