From Redditor /u/connain:

I was [in] a mischievous mood so I decided to perform a "social experiment". I built a very bland house. Basically a big square of unpainted walls without windows and only 1 door. Once I had the whole neighborhood trapped inside I remove the only way out.

Inside the house there was one refrigerator [...] and, right in the center of the house, a single toilet. I wanted to see which Sims would unashamedly use the toilet in full view of everyone else. Most did not want to.

Slowly I would shrink the walls as people moved away from them forcing everyone closer and closer to that one, lone toilet. The whole neighborhood, all fed and needing to use the toilet, nearly all too ashamed to user it standing around in a tight, confined space all staring at the toilet longingly. Many were standing in puddles. Woe betide them that fainted.