We did it on purpose once, many years ago.

Were in Stratford Ontario for a Shakespeare weekend, and had pre-theatre dinner at a place that turned out to have horrid food and worse service.

When it came time to get the check to pay our bill we couldn't find ANYONE to give money to - it was like the entire staff had vanished. After about 20 minutes as curtain time got closer and closer we finally got up and left.