you're sources are a bit off... this wasn't fought for real: "One of the many highlights of the movie is a wild, five and half minute fist fight between the David and Piper over a pair of the special sunglasses. The brawl starts off serious but eventually transforms into an absurd free-for-all. Carpenter remembers that the fight took three weeks to rehearse. "It was an incredibly brutal and funny fight, along the lines of the slugfest between John Wayne and Victor McLaglen in The Quiet Man."