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Let's say you're traveling abroad; maybe you're in Italy. You're minding your own business when some Italian fellow accidentally bumps into you. He asks if you're OK (he speaks English, and assumes you do too in this case. Just go with it) and you respond with the universal symbol that all is well: the thumbs up.

Well guess what? You just implied to this Italian polyglot that you're going to do something very uncomfortable to him with your thumb. This whole situation has gone from bad to worse, and all because you didn't heed the following embarrasment-saving chart from justtheflight.co.uk.