Stepping on someone's head and knocking down him
something like this.
if it is possible to do with MMA, it will be fun :P
Or implement a B+down Link attack (super smash anyone?), so you do actually have to do something but you instantly kill the guy below by stabbing him and pushing it downwards with your weight :D
Only if there’s a sound like in mario when you stomp him… and coins, alot of them.