Three firsts:

First season. The Enemy Within, Kawalsky awaiting surgery, and Jack's usual method of coping:

Jack: Listen, I gotta ask you something. It's not easy for me.
Kawalsky: We're friends.
Jack: If you don't make it….. can I have your stereo?

(Ah, Charlie – you know he means "You're my friend and I care about you and don't die and don't worry it'll all be fine, I promise!" It just comes out a bit… wrong.)

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First season I bought – season 4 (predisposed towards being a Sam/Jack shipper? Moi?). Beneath The Surface, and even with a mindstamp, Jack is essentially… Jack:

Jack/Jonah: My memory’s fine!
Daniel/Carlin: Really?
Jack/Jonah: Yeah!
Daniel/Carlin: What did you do in the mines?
Jack/Jonah: I mined.
Daniel/Carlin: No…what did you do?
Jack/Jonah: I remember shovelling ore into a cart.
Daniel/Carlin: And?
Jack/Jonah: I did that a lot.

(It's the way he says "I mined" that I love most about that. I suspect if they pushed him some more, he might recall pointy hats and the hiho song. Or would he remember the mines from Need, and the days - weeks? - they spent down there?)

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First episode I watched – Full Alert (yes, an ass-backwards one to start on – it was showing on TV), and Jack finally has the upper hand in dealing with Kinsey:

Kinsey: Who are you calling?
Jack: Local sheriff’s a friend of mine.
Kinsey: I may be disgraced, but I’m not wanted for any crimes.
Jack: Breaking and entering?
Kinsey: Jack ...
Jack: Shh. It’s ringing.

(And then Kinsey pulls the cord out the wall, and Jack pauses for a moment – then takes out his mobile and begins dialling again. Hee! So, so deliberately, gleefully annoying. He's wanted to be like this towards Kinsey for years.)