Sylvester Stallone and Richard Gere
According to rumors, Sylvester Stallone and Richard Gere got into a fist fight while on the set of The Lords of Flatbush. While the reason behind their rivalry is not clear, the duo has not worked together in any movie ever since.
I wouldn't work with either of them. I don't much like being punched. ...or shot.
Snipes spent almost the whole time in his trailer getting stoned, barely showing up when needed, and at one point attacked the director trying to kill him.
Snipes basically left the production, half of his scenes unshot, leaving the rest to try to cobble together a movie with half rewrites and workaround scenes to make it a somewhat coherent movie.
It was the whole reason why the movie was so bad.
He refused to memorize his lines, and often couldn't even say them because of how baked he was. There's even a scene where, just to be a d@#k, he refused to open his eyes. They had to CGI the eyes in after.