I Know What You Fear: The monster of the week could sense people's worst fear and made them real. Some were literal monsters (a wasp man or a generic villainous killer). A man panicked because he thought his partner would leave him. One woman died of exotic disease simply because Scully had mentioned its name.
Jitter Cam: Lots of the scenes were shot with a hand-held camera while running and moving and presented as a part of reality show.