I'm not entirely sure if this counts as gambling, but everyone in my office contributes $1 to a pool of money twice every week. We spend the money on Powerball tickets; any winnings are put into a kitty. We figure if we get the biggest jackpot, the entire department will quit at once and the whole company will be screwed.

...not really, but it's kinda funny to think about even though we know it will never happen.