Unfortunately I'm having a very busy week, and I can't find the time to write a proper post.
However, I found this nice picture explaining some Italian hand gestures. It is true that we Italians use them a lot, anyway as you can see there are plenty of them, not only the most famous one, which is the first one in this picture, "What?/Where?/Why?". I have some foreign friends who always greet me that way when they see me, as if I did nothing but that gesture all day long... We are more creative than that! So if you want to learn how to speak Italian, be aware that it's not enough to go "What?" all the time... you might want to learn some other gestures as well :)