How I Met Your Mother, Season 6

[Barney and Robin have just been summoned to the Natural History Museum security office for pulling off pranks. An unexpected revelation about Barney's uncle actually being his father hits him hard.]

Robin:
So, when was the last time you saw him?

Barney:
It was that day, July 23rd, 1981. My mom got pretty upset he let me destroy a New York City landmark.

Robin:
[scoffs] Moms.

Barney:
He never came around anymore after that. Think he moved away.

Robin:
Well, maybe the security guy had it wrong, you never know-

Barney:
You do know, you do know, that's the thing, you know. He's my dad. [long pause]

Robin:
Barney, do you wanna-

Barney:
[emotionally] I don't wanna do anything. Don't tell anyone about this, okay?