Stargate Atlantis, Season 2

Dr. McKay:
I wonder why we never hooked up.

Lt. Col. Carter:
What, aside from the fact that you're petty, arrogant and treat people badly?

Dr. McKay:
...yes.

Lt. Col. Carter:
Nope, that's pretty much it: petty, arrogant, bad with people.

Dr. McKay:
Oh. But you do find me attractive?

Lt. Col. Carter:
Let's stick to working on my idea.

Dr. McKay:
No, this is my idea.

Lt. Col. Carter:
How do you figure?

Dr. McKay:
Well, you don't exist. You think what my subconscious tells you to think! So, really the idea was mine. [realizing] Oh, wow! I'm arguing with myself about who had an idea first-me or me. I really am petty, aren't I?