The X-Files, Season 6

Scully:
I don't know. It's not a simple bisection. There's a considerable amount of his abdomen missing. I mean, it almost looks like a burning but it's too localized. Maybe an industrial acid.

Mulder:
(looking at the report) There's, um... no acid found in his office.

Scully:
Oh. (long pause; seriously) Spontaneous human combustion.

Mulder:
(grinning happily in disbelief) Scully...!

Scully:
Well, isn't that where you're going with this?

Mulder:
(smiling) "Dear Diary: Today my heart leapt when Agent Scully suggested spontaneous human combustion."

Scully:
(defensive) Mulder, there are one or two somewhat well-documented cases. (He says nothing; looks off to the side and nods thoughtfully; she sighs) Mulder, shut up. (He tries to look innocent and totally fails)