One man was criticised online as "cheap" and "rude" after boasting about an experimental tipping method he tried while out to dinner with his wife.
The US man uploaded a picture of five $1 bills to Facebook, explaining it was all you needed to get the "best service of your life".
"You put 5 singles out on the table at the beginning of the dinner for the waiter/waitress to see," he explained.
"(Don't say anything to them) if they mess up, you take a dollar away, and so on. At the end of dinner how ever much is left is their tip."
He said the waitress was confused by what was going on but eventually earned the whole $5.