Apparently, there's a guy in Provo, Utah who sits on his porch and flips the bird at every person who goes by. He uses both hands and doesn't stop bird-flipping until the passer-by is out of site. He is known around town as "Middle Finger Man."
This blogger decided to video tape MFM and see how long it would take for him to lower his hands in defeat. The answer: only about two minutes. Here's videotape documentation.
Dave and I headed over there and pulled off to the side of the road. We waited til the traffic cleared and then made our approach. MFM saw me and my camera and assumed his position...middle fingers up. I made my challenge and he accepted it with his version of a thumbs up. We tried to talk to him a few times, but he was not interested in conversation. Well, long story not as long, it was a little over two minutes before he finally lowered his hands in defeat. He also broke with a smile because he knew he was beat.