I always tip between 15 and 20 percent irrespective of the quality of service because being a waiter/waitress is hard enough without making way below minimum wage.

This restaurant patron clearly disagrees with me.

They decided to "teach" their server a lesson in "waitressing" with a note bashing her "lack of serving skills" topped off with two Canadian pennies.

Then again, maybe their service really was that bad. After all, they left a pretty nasty note despite being Canadian.

Is there ever an excuse for inconveniencing customers? How bad would it have to be for you to leave a note like this? Have you ever left a note like this? Leave your two cents in the comments.