I read a really lame car advert once that listed 20 things one should do before one died, including world travel, fine dining and such, and predictably, #20 was "Buy a new Oldsmobuick Scavenger". The ad sucked ass, but one of the must-dos struck me as a good idea.

Hide a twenty dollar bill on a school playground somewhere a child will find it.

I like this one a great deal.