I go pound on the piano. The more aggressive the piece the better. My husband knows that when he hears "Hungarian" by Edward Macdowell, just to send all children running, and not even try to get in my way or ask questions.
It is the musical equivelent of slinging an axw at a chord of wood. And if I d not finish that song with perfection, I will just keep going and going, until it is etierh perfect - or my finergs cramp so badly they can't move.