I would have said "Favourite Teal'c Line", but there's probably not enough of them for it to be considered spam. I'll kick it off with these three. First, from Rite Of Passage, when Teal'c freaks Jack out with the mysterious items in Nirrti's lab -

Jack: What's this for?
Teal'c: What do you think it is for?

And a bit from The Other Side -

Jack: So what's your impression of Alar?
Teal'c: That he is concealing something.
Jack: Like what?
Teal'c: I am unsure. He is concealing it.

And in Smoke And Mirrors, Teal'c clotheslining Dr. Langham, and then interrogating him by simply acting scary as hell. He's so cool.

For more fun with Teal'c and Jack, dknightshadehas an interesting discussion of their developing relationship here, with reference to the current redial_the_gateepisode, Message In A Bottle.

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Also, I've now added the answers to the unguessed lines on the song meme. And posted yet another Sam/Mac story to LeapGate. I am a busy bee.