My buddy, Peter, has been accumulating empty soda cans at work so he can glue them together into a giant Godzilla. So, there's a stack of probably 200 cans on his desk just waiting to be messed with.
While he was at lunch today, i took fishing line and ran it through a bunch of the cans and then ran it past the front of his cube.
I sat back and watched as he returned from lunch and hit the line to see tons of cans go flying in his direction. The look on his face was priceless... I wish I'd set up a camera.