Hmm, I really love Triangle (the one where Mulder ends up in an alternate reality on a ship in the Bermuda Triangle). Thanks to M for reminding me that I also love How the Ghosts Stole Christmas where Mulder and Scully get possessed by the dead people in the house.

The skeeviest episode is that one where the deformed incestuous family with the mother under the floor boards is trying to keep their "clan" going. Gaah.