Nobody ever goes to the toilet. (Except in "Ice Cold in Alex")
You've obviously not seen Rudiger Vogler take a very real shit in Wim Wenders' 'Kings of the Road'.
Wim Wenders' interviewed about it far later....
"That’s gonna pursue me for the rest of my life. The truth behind it is that we shot the scene with the guy taking a leak, and then the camera assistant said that we had to do it one more time because the camera jammed, and it’s not on film. I had to break the news to my actor, and I said we had to shoot it again. And he said, well, I can’t do it one more time, I mean, I can only fake it, and I said, well then, just take a shit…. in a provocative way because I thought he’s never gonna do it. And before I knew it, he was leaning down and he was actually taking a shit, and we all were breathless. I didn’t say cut or anything, because he was doing it, so we’re filming it, and I knew in my heart we were never going to use because…. you can’t do that.
Then we came to the editing room, and the editor said, you’re not going to use that, and I said no, but then he said what are we going to do without it, and I said, go ahead, we can always take it out again.
Then it became this thing, because he began teasing me that I didn’t have the guts to keep it in, and it became a game, and it stayed in, and then it was too late to take it out, and it was forever in.
It was the first film I showed in Cannes, and the director of the festival came to me and said, “We all love your film very much, but you have to take that scene out. The jury is not gonna reward it.” But it was too late, because now that it’s in, now I have to insist that it’s in.
I regretted it very often, but then again, at one point, I had to stand up for it. It followed me for the rest of my life. The actor, poor Rüdiger, it marked his life."