Midnight Cowboy
Sometimes you just have to get the shot, and in the scene where Dustin Hoffman was crossing a busy New York street the production hadn’t gotten permits to shoot. While Hoffman was trying to cross a car actually came close to hitting him, stopping just short, and causing Hoffman to shout his iconic line, “Hey, I’m walking here!”
I live near very near to LA; I know people who work in the film industry. Around here, a lot of people would have firsthand knowledge of that sort of thing, so it wouldn't be unusual to hear from someone who knows something such as that.