Well, the whole waving thing can be overdone. Me and a friend came barreling up to a guy stretched out on the shoulder, some guy on a cell phone standing nearby, a wadded up bike in the ditch.
Before I could process it all, I waved to the biker out of a sort of reflex, I guess. Found out late he had broken his leg. The thing that kept me from feeling like a total idiot is that the guy WAVED BACK.