Ultimate rube goldberg machine »

Cory Doctorow: This video documents a rube goldberg machine that spans multiple storeys of a residential house, running from room to room, with transitions that include stairwalking slinkies, a computerized magnetic chess-set, and the piece de resistance, a cellphone that calls another phone elsewhere in the house, setting off a vibration ringer that triggers the next reaction. Must be seen to be believed. Link (Thanks, Richard!)