That is some very ornate guilt right there. (Via)
According to redditor Drewbacca, the above is the cover image for a very contrite apology card dropped off at a pizza place by a mathematically challenged couple in Portland. The couple apparently failed to calculate their tip correctly, sending Drewbacca away with a measly thirty-three cents. The next day, the couple showed up in person to make amends.
Drewbacca shared the card on reddit with the title, "Last night I delivered pizza to a couple, their total was $22.67. They handed me 23 bucks and told me to keep the change. Luckily I'm not rude to customers who don't tip (I just bitch about it later) because they came in today and dropped this off. Amazing!"