HAH! There is this copland piano work that involves you making your hand like a karate chop, and then turning your body so that your hands are flat and straight and not... facing... ok this is really hard to explain...
Umm okay.. so you have your hands like you're going to do a karate chop... and your sideways on the piano... and instead of having your fingers facing the keyboard.. they are facing the right side of the piano... and with your left hand, you are banging on the black keys and going down.. and with the right hand you are banging on the white keys and going down... like a glissando! Except, your not sliding.. your just bashing the keys in a funny way... It's hard to explain
Not hitting the keys with fingers either, your hitting like..7 notes at the same time with the side of your hand...