I've been in Calgary's Bonnybrook sewage treatment plant, including the building where the effluent first enters the plant. That is by far the worst smelling location. The effluent goes onto tables where the condoms and tampons etc gets sorted out. Kind of gross, but the smell is manageable.

After surgery, I was on an antibiotic, that the longer I was on it, the worse my digestive system functioned. One night I was semi comatose in bed and thought I farted. No biggy. Later I had gas again and woke up more fully to realize that the bedding was damp. I got up and I couldn't stop it. A trail of liquid crap across the bedroom carpet to the ensuite where I managed to pretty much hit all four walls and cover the floor with the crap. Smelled like some sort of sick animal. Probably took me 2-3 hours, trying to not put weight on my surgically repaired foot, to clean up. My wife gets up and asks what's that smell. Why didn't I wake her up? Well I was plumb embarrassed for one thing.

Sure was glad to say good bye to the antibiotic.