Even though Francis Ford Coppola carefully sketched out so much of the film, unexpected twists during filming resulted in some of The Godfather‘s biggest gems. Perhaps none had a bigger impact (in the literal and figurative sense) than Lenny Montana as the feared enforcer Luca Brasi. Montana, a 6 ft. 6 in., 320-lb. professional wrestler, was working as a bodyguard for real-life mobster Joe Colombo, who had come to the set. Coppola and producer Al Ruddy quickly cast Montana as Brasi. When we meet Luca, he’s waiting to see Don Corleone on Connie’s wedding day, practicing his greeting nervously. But that scene was shot after the one in which Luca greets the Don. When Montana stood in front of Brando, he froze and fumbled his lines. So hoping to take advantage of the misstep, Coppola later set up the scene in the garden where Luca nervously practices his lines while waiting to see the Don, implying that Don Corleone is the one man Luca Brasi fears.