The X-Files, Season 1

Scully:
From the trucker's description, the shape he fired on could conceivably have been a mountain lion.

Mulder:
Conceivably.

Scully:
The National Weather Service last night reported atmospheric conditions in this area that were possibly conducive to lightning.

Mulder:
Possibly.

Scully:
It is feasible that the truck was struck by lightning, creating the electrical failure.

Mulder:
It's feasible.

Scully:
And you know, there's a marsh over there. The lights the driver saw may have been swamp gas.

Mulder:
Swamp gas?

Scully:
It's a natural phenonemon in which phospine and methane rising from decaying organic matter ignite, creating globes of blue flame.

Mulder:
Happens to me when I eat Dodger Dogs.