Allison Janney, Life During Wartime
Janney accidentally sent her scene partner Michael Lerner to the hospital while filming their steamy part. “We had to have sex up against a wall and they started spraying us with glistening stuff to make us look sweaty, but no one seemed to realize that we were standing on a marble floor," recalled Janney in an interview, "They said action and he … pulled me up against the wall and his feet slipped out from under him and he went crashing down on the floor. It was terrible, but it was one of those moments I’ll never forget.”
Keanu Reeves, Knock Knock
Keanu Reeves appeared in the 2015 movie "Knock Knock" with none other than the director's wife. It was even weirder that all his sex scenes were actually threesomes, and the director was totally fine with everything. "Eli [Roth, director] created a great situation of trust in rehearsal...but eventually you've got to strip naked and simulate," said Reeves, "and I wasn't going to be that guy who was like, 'Hey Eli, your wife's hot!' Yeah no, he was really cool about it and we all...had fun."