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1.
If the service in a restaurant is SO poor you can always detip.

If they have added the 12.5% service charge you take it off PLUS an extra 12.5%. Remember to explain why you have done it.

If there is no service charge simply take 10% off your bill.
"This food is shit and the person serving it takes bloody ages to do anything, lets detip."

"Detipping... that means more money for booze. Let's do it!"
by JHRW April 26, 2011