Across whole show

[After spilling coffee on his lap.]

Mulder: Great, now my crotch will be up all night.

Clyde Bruckman's Final Repose (series 3)

Clyde Bruckman: You know, there are worse ways to go, but I can't think of a more undignified way than autoerotic asphyxiation.

Mulder: Why are you telling me that?

Clyde Bruckman: Look, forget I mentioned it. It's none of my business.

Triangle (series 6)

Skinner: Use your head Scully. It'll save your ass.

Scully: Save your own ass, sir. You'll save your head along with it.