By Fareed Zakaria, CNN
If you're a citizen of the world, which you probably are if you're on this site, you might want to check out a book called Don't Get Me Wrong: The Global Gestures Guide. The book is all about how different hand gestures mean different things in different places.
For instance, here in the United States, if you want two sugars in your coffee, you might make a certain gesture at the barista. That same gesture means "eight" in China. And the same hand signal with a little movement added means "not good" in Italy.
Put those fingers on your forehead, and it means "loser" in many parts of the world. But let's go back to Italy for a second. I would suggest being very careful with your gestures there. President George W. Bush and his wife Laura may very well have made enemies out of married Italian men on Inauguration Day in 2005. Why?
Well, they flashed the cameras with the symbol of the Texas longhorns - the hook 'em horns. In some parts of the world, it's the symbol for "Rock On." Unfortunately, in Italy it means, "Your wife is cheating on you."
Check out the video above to see the signals.