Let's say you're traveling, and you want to make sure that some innocuous hand gesture doesn't offend someone without you even realizing it. Alternatively, let's say you're traveling, and you want to start some fights. Either way, you deserve to know what you're actually communicating to people with your body language. These hand gestures are likely to cause offense depending on where you are in the world.
1 of 10 10. Thumbs Up
In America, this usually means, "Great job!" In Greece, Latin America, the Middle East, Russia, and elsewhere, it means "Up yours!" If you really want to be offensive, you can thrust your thumb upwards to emphasize the offensive message, but odds are you really just want to avoid it.