At work I've been the source of some amusement among my coworkers because I've shown them a few ways of that finger-borne "fuck you" that go beyond the basic, static showing of the middle digit.
It started when I did the one where you turn an imaginary crank with one hand, jack-in-the-box style, and slowly raise the middle finger on the other hand. Most of my coworkers are Filipino and have never seen this before, and boy... did they LOVE it.
Next, there was the 'inflate a rubber glove by blowing into your thumb' bird flippage, then I "invented" one on my own which involved giving a thumbs up then smacking the thumb inward with the other hand, and out pops the middle finger.
An non-Filipino coworker introduced a trumpeting version where the fingers fly up and down to a tune, miming the air holes on a trumpet, and the middle finger pops out and holds with the last high note.
SO.
What have you guys got?