Fame had a character pretend to be taking a dump as an assignment for actiing class.
Silent Movie had a scene in which a merry-go-round horse begins releiving itself while Mel Brooks and Anne Bancroft kiss.
Not exactly poop scenes, but close.
Didn’t Happiness have some sort of crap scene in it? I can’t remember at all, but I want to say it did.
La Grande Bouffe, where the guys have decided to shut themselves away and eat themselves to death, has a pooping scene to pretty much end all pooping scenes.
It starts off as a fart, I think, and ends up with the bathroom floor practically collapsing: it’s been a while since I saw this movie.
Lethal Weapon 2 shows Murtaugh sitting on the toilet when he realizes it’s booty-trapped with some sort of pressure-sensitive bomb trigger.
Fun times.
Oh, crap, this triggered a memory of seeing P.P. Pasolini’s “Canterbury Tales,” and among the montage at the end, seeing a man on all fours — I believe a devil — lift his tail and … cough … spew great gushes of … ulp … stuff … out his *ack!
Excuse m
Andrei Rublev has a mentally disabled young woman walking along who stops, urinates on the floor, and then continues what she was doing. Fairly realistic, and it doesn’t make a big deal of it, either.
It was Mr. Fishfinger. The same movie later had a young boy pissing out the window near Dennis, and a castle guard who goes off to take a dump off the ramparts.
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I must find that movie.
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Your location is quite appropriate.
In The Full Monty, there’s what seems to be a woman making use of a urinal for real.
Peter Sellers in “The Party” has a poop scene as only he could do it.
I don’t know whether a biographical movie of the life of Jung has ever been made, but if it has, it must include a scene in which God crushes the cathedral at Basel with an enormous bowel movement.
In Dr. Strangelove, General Turgidson (G.C.S.) comes out of the can after his secretary relayed the “attack command” message to him while he was “indisposed”.
Did you know she’s the same gal (Tracy Reed) that was the centerfold in the bomber crew’s Playboy?
Surprised no one’s mentioned this one yet: Meet the Fockers. In one scene, Robert DeNiro hears noised while showering, peers through the curtain, and sees Dustin Hoffman merrily sitting on the can. The end of the scene is something like:
DeNiro: “You mind giving me a little privacy here?”
Hoffman (smiling): “Almost done.”
Surprised no one has mentioned the disgusting scene in Dream Catcher. I believe they called it a “shit weasel” in the novel.
There was a Western where a couple of guys were trying to kill a cowboy who was heavily protected by some men in a cabin and they waited outside until he went to the outhouse, then they flung open the door and shat him as he pleaded for mercy. Was it Unforgiven?
There was a somewhat similar scene in Young Guns. Billy the Kid (Emilio Estevez) shoots someone in an outhouse, IIRC.
Bolding mine. Anybody else, I’d assume it was a typo, but knowing you, lieu, you did that on purpose. 
Yes, it was Unforgiven. Although, both men didn’t shoot the guy; just the younger, self-proclaimed “gunfighter” did it. He later tried (unsuccessfully) to drink away the memory of the killing. Will Munny (Clint Eastwood) was covering him while the kid did the shooting, because the kid was all excited about adding “another” kill to his “total,” which we learn later was exactly zero at that point.