I just read a thread like this on buzzfeed. My favorite one was somebody who talked about making a really short character with green skin. They would make a room in the basement with a toilet, refrigerator, bed, and easel and that was it and remove the stairs. They would just sit in there and paint all day everyday until they got really good and their paintings woul sell for a ton of money. Then it was like the family upstairs was making money off the goblin artist in the basement
Another one was somebody who really wanted to make a cemetary so they kept having babies and killing them...that one was a little messed up for my taste.
Oh the sims... good times. I apparently wasn't creative enough in my own evil nature though.