Mona Lisa Painted in 80 Milliseconds
Mythbusters is a pretty interesting show. This is a tragedy, to me, because every time I watch it and see the mustachioed guy wearing his insufferable beret, my belly fills with hate. I'm reminded of every pretentious professor who scoffed at me for sleeping in class and outperforming the students who would felate his ego with rapt attention during lecture. That being said, they built a paintball gun that can paint the Mona Lisa which is pretty rad.
While it'd be okay if they did it just to rock, they actually built it to illustrate the difference between the processing speeds of single and multi-core processors (CPU versus GPUs).