I just "got a new ghost" the other day (see the bright, shiny halo over my head? I didn't do nuthin'
), and I sent a couple of knowledge teens out on the front lawn one night when she was active, free will off. Both my knowledge sims wanted to see a ghost. I also had an assortment of family members and aspirations out there with them. The ghost scared the same sim NINE TIMES until he finally peed his pants and had to shower. He is a popularity sim, and had absolutely no desire to see this ghost. She ignored everyone else until I sent Cam in to shower, so she then picked on a teen pleasure-seeker until dawn broke. Not a good memory for him, either, and he had to shower after the 5th or 6th time. My knowledge sims didn't get spooked once.