My mom bought Bink a Busy Ball Popper for Christmas. For those you without one, it was described to me as baby crack. He LOVES the thing, but hasn't quite hit the age where he knows how to work it. Mostly he climbs on it and tries to take the balls out the eat them.
He, K, and Hubby have worked out a system though. K chases the balls after the spray across the room (and squeals about it). Hubby pushes the control button with his foot. Bink steals the balls to eat them and giggles at how goofy his sister is. Me? I take video for posterity.