It's good to give money to people for their trouble.
Ben's car broke down in the middle of a highway, and a stranger stopped to help.
Ben wants to thank the stranger.
Ben gives the stranger a $50 bill as he gets ready to leave.
Ben offers the stranger a hug and thanks him for what he did.
The stranger thinks that it was worth it to stop and help.
The stranger isn't compensated for helping Ben when he didn't have to.