The Vampire Diaries, Season 1

Damon:
Am I the only one around here who has the ability to put two and two together? Isobel! Helloooo! She dated John when she was 15; she gets pregnant, and ends up in the doctor's office of John's brother. Now, what do you think John's role is in all this? I mean, go ahead and think about it, I'll wait. (pauses) Did you get it? You there yet?

Stefan:
So you think that John is Elena's father?

Damon:
Ding, ding, ding, ding!

Stefan:
What proof do you have?

Damon:
I don't need any proof - that's a DNA test for John, Elena, and Maury Povich to deal with. But I know how well you deal with these big "bombshells", so... Sleep tight.