Maybe they shit on a piece of newspaper or something behind trapdoor number 1 and then placed it on the floor when the coast was clear. Easier to get away with. But logistics aside, who shits on the floor? (Except kids not yet toilet trained and old people in nursing homes--yay that's something to look forward to.) Gross!
My god, you have a fiendish mind!! I have really been wondering how someone could risk taking a shit on the floor. That methods would work perfectly. It did imply some proper prep and thinking though. That's worrying!!
I had some gross male friends back in the day. Or at least they were. Now they're in their 40s and have kids and mortgages so I expect they have much less time for thinking up these kinds of activities.
They have fiendish minds!! I am still impressed though. That's bloody awesome!