This can be highly amusing...
My wife is Iranian and went back for a visit after 20 years out of the country. She watched a band playing, requested a song, when they played it, she gave them a big thumbs up... and immediately remembered what that meant in her own country (equivalent of flipping the bird here in the US). Nice way to thank someone! She was mortified, but they fortunately knew what it meant over here and weren't too offended.
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