Mythbusters Build 1100 Barrel Paintball Gun
Always ones to do something completely ridiculous to demonstrate something, Mythbusters build a 1100 barrel paintball gun to paint the Mona Lisa.
They used it, and a single gun attached to a robot, to show the differences between a CPU and GPU, or more precisely single-core to multi-core processors. It’s not really a good explanation, but it does look cool.