I accidentally found an interesting tip as I was searching the net for tip advices. Here it is...
Adjust the amount of the tips so every item that's added to the bill ends with the same digit. Example.- Tip odd amounts to have the bills for all meals end with the numeral six It takes only a moment to skim the fist for items that don't end in six, and thus don't belong on your bill. The odds of an accidental six occurring on the bill are nine-to-one in favor of the traveler.
I have to try that out on my next trip.
source: Travel Secrets
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