Waiting in a checkout line with about twenty items. Needed them all at the time. (Shin bone's connected to the thigh bone type of thing.) I keep a running tally in my head, but that time I just plain lost track. I was about a buck and a half over due to sales tax--something there wasn't in my old province of Alberta. As I was deciding which item I'd have to do without, a fellow I'd never seen before plopped a toonie down to cover my shortfall. He said someone had once done that for him. It happens, and when it does it's nice.