It's always nice finding money in your pockets after the wash. Last night, in the left pocket of my pants, I found the stub of a traffic violation I recieved a few months ago. Folded up inside was the one hundred and five dollars I was supposed to use to pay it but had misplaced. I had completely given up hope of finding it. 
I always seem to find five bucks.
It's the perfect amount, because it's enough you can actually do something with it, but not so much that you feel guilty just blowing it.