10 Ways You've Been Accidentally Insulting People Every Day
7. Thumbs Up
The next time you feel like telling someone they're doing a good job, double check your surroundings before giving them a thumbs up because you might just be giving them the equivalent of the middle finger.
If you happen to be anywhere in the Middle East, West Africa, South America, Greece, Russia, southern Italy (including Sardinia), Australia, the Philippines, or any parts of the Muslim world, you would be better off finding another way to give someone an approving gesture. That's a lot of countries to remember; perhaps you would be better off avoiding sticking your thumb up altogether?
Scholars believe the thumbs up originated in ancient Rome, and guess what? It had a negative meaning there as well. Crowds watching a gladiator event would give a thumbs up if they wanted the losing gladiator be killed.