Guilt Wash

When you are in a public bathroom and you have no intention of washing your hands after using the bathroom, until a random stranger comes in, at which point you wash your hands out of fear that the person will think you are a dirtball.

Ty was finished peeing, and a man walked into the restroom. He wasn't going to wash his hands, but since the other man was there, he walked to the sink for a guilt wash.