Just do it once...to feel the efect of eXtreme pwn

contract elbows
grip hands
skip exactly 31 frame

hold all*
extend elbows
extend wrists
p

*don't hold all for another effect
*2 if not holding all, try skipping only 30 frames for another, third effect

Haha, That's one nice move samurai

Well, there a 3 moves all with different effects

And here are reps for lazy people, who can't do such an easy move:

That was freakin great headbang hahaha