Thump ... thump thump!
My son is in the thumping stage, where pretty much all the time, even when happy, he is thumping the floor with his heel, or kicking the chair legs. I remember being in that stage, and being told over and over to stop. He's also in the stage where I tell him over and over to wipe on his napkin, not on his clothes. Or wait, maybe I'm in the phase where I tell him. Whatever. Thump!