12/01/2012 10:03 am ET Updated Jan 31, 2013

Funny Receipts: 28 Ridiculous Instances Of Cash Register Hijinks (PICTURES)

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.