Originally Posted by patrickBOOTH
A lot of people are just plain cheap.
My great grandfather would bring two cans of Budweiser in his pants pockets to restaurants. One time he did it when my grandfather was there, and the waitress saw it. Gramps basically said, "Dad, if you ever embarrass me like that again, this is the end of me taking you to dinner." I think he stopped.
He also would take wads of napkins and ketchup packets from McDonald's and the like, and of course never used them.