S11E2 - Magical Mulder
Besides him *gas pedaling* to death his Mustang, he magically could sneak up on the guy shooting them in the graveyard in a pretty much open field with only the tombstones in the way (legs were showing but nope, gotta shoot the tombstones).
The other part was when they were trying to get into Titan and Scully played the captor, Mulder used his index finger in his mouth to emulate a gag on the FBI dude before Scully slaps some sense in him. That security guard behind the glass could clearly see them but nothing happens... >_>