Pre-School is a fairly interesting South Park episode.It shows the boys at a younger stage and something bad they did, which is now coming back to haunt them.The plot of the episode involves a bully named Trent Boyett being released from juvie.He wants to get revenge on the five kids(Stan, Kyle, Kenny, Cartman and Butters) who betrayed him back in pre-school.The boys wanted Trent to start a real fire so they could put it out(by urinating on it), Trent does so and this causes their teacher to catch fire.The cops then take Trent away and the boys will not fess up on the true story.The episode then involves the boys trying to find protection and run away from Trent Boyett after he puts Butters in a hospital.The episode is pretty funny, interesting and good.Not the best but not the worst of Season 8.