Grandpas $2 Bill

*Knock Knock* You get off the couch and answer your door. It's your grandfather..He came to wish you a happy birthday. It's kind of strange because he usually just calls and that's the end of it. "Thanks.." you say.  "No problem" he takes something out of his pocket. "I think it's time I gave you this, I've gotten my fair share out of it." He gives you a crumpled $2 bill. "You don't see these much…