Is that for real? Is that American Sign Language?
I remember in high school, my best friend's gorgeous little sister got in a car and was driven away, signing something to him out the back window (I don't know why or how she was learning American Sign Language, we were too small to offer a course like that).
My friend started laughing, and I asked him why.
He said she had just signed F**k You.
I always thought it was a great means of semi-secret communication, even for the non-speech or hearing impaired.
Like the Navajo code talkers in WWII.
Or the fictional Dune book series hand signals.
Then there was this unforgettably beautiful tall girl in Georgetown that I couldn't communicate with...