The chances of accidentally insulting someone is greater when you travel internationally, thanks to differing customs and ideas of etiquette. Even common hand gestures can signal the wrong thing.
Mental Floss has gathered five hand signals that don't mean what you might think, depending on the country you're in. A thumbs up, for example, doesn't mean "good job" in parts of Latin America, West Africa, Iran and Sardinia — it's more like giving someone the finger. Likewise, the peace sign is not so peaceful in the UK, depending on how your palm is turned, and the OK sign does not mean "OK" in the Middle East, Turkey, Germany or Brazil.
What Hand Signals Should I Avoid When Travelling Abroad? [Mental Floss]