Oh, definitely. I have two rather attractive sisters, and I have fantasized about them being snuffed. When I was a teen, I always dreamed of some burglar or serial killing breaking in, and killing everyone else but somehow I survive. After the creep leaves, I come out of wherever I'm hiding and play with their bodies before I call the cops.

Usually the fantasies did involve one to them being on the toilet at the time; the killer comes in and either puts a few bullets in their head or sprays their bodies with a machine gun.