Mr. X Blind Item - 1980's

'80s: What two A-list actors, back when they were both almost A-list, almost got into a fistfight on the set of their debut film? Between takes, Actor #1 called Actor #2 a gay slur (the one that starts with an f and ends with a t) and Actor #2 went berserk and they both had to be separated by crew members because it was about to get violent. The two actors are on somewhat friendlier terms nowadays and they won't talk about this incident for obvious reasons.