Family Guy, Season 8

Quagmire:
Dad... Are you gay?

Dan:
What?

Quagmire:
Are you gay, Dad?!

Dan:
No, Glenn. Of course not.

Quagmire:
Just tell me the truth!

Dan:
I am telling you the truth. Now, calm down. You're ruining this ball. You know how much I love balls.

Quagmire:
Oh, come on. That's not helping.

Dan:
Glenn, you have my word. I'm not gay.

Quagmire:
You promise?

Dan:
I promise.

Quagmire:
All right. I believe you.

Dan:
But I am a woman trapped in a man's body, and, while I'm in Quahog, I plan to have a sex-change operation.

Quagmire:
[stunned] Oh, come on. Just be gay.