What is the oddest thing you've seen your Sims do?

I've had quite a few Sims who were standing in the hall outside the bathroom, or even in the bathroom when the nauseated moodlet ran out...and they ran to some strange location to vomit. Like, down the street outside. A block away!

I also had a Sim who would clean up all the dishes and then just stick them on their roommates' table or plop them outside...despite having his own dishwasher and many, many sinks. :p