Was browsing 9gag today and came upon this. Thought it was pretty neat.
http://d24w6bsrhbeh9d.cloudfront.net/photo/1860660_700b.jpg
"Put an aligned deck of cards on the edge of a surface. Move the top card slowly until almost 1/2 of it is out of the deck. Move the second card slowly until you have almost 1/3 of it out. Now you have approximately 1/2 + 1/3 of a card out. Move the third card until it is almost 1/4 out and you will have 1/2 + 1/3 + 1/4 of a card out. Keep doing this while decreasing the amount each lower card is away from original position and you will manage to keep the deck balanced.
Since the sum 1/2 + 1/3 + 1/4 + ... doesn’t converge, it is possible, theoretically, to reach an infinite distance while still keeping the CG of the deck inside the surface. "