A receipt may not be the first place you look for humor -- after all, they're designed to be so regimented and boring -- but some people out there are getting really creative with their cash register etiquette.
Whether it's a "best butt" discount, or a tip that just says "math," people know how to be funny (or weird) in astoundingly concise ways.
Whether it's the waitstaff or the customer, there's plenty of receipt re-interpretations.
Check out the pictures below.
