Seinfeld, Season 8

Elaine:
[after Jerry's girlfriend's toothbrush got knocked into the toilet] You still couldn't kiss her?

Jerry:
She has a taint. I can't see it, but I know it's there.

Elaine:
Oh, so now you're finding fault on a sub-atomic level.

Jerry:
Maybe if I could shrink myself down, like in Fantastic Voyage, and get inside a microscopic submarine, I could be sure. Although if there was something there, it might be pretty scary. Course, I would have that laser.

Elaine:
Jer, do you see where this is going?

Jerry:
Being really clean and happy?

Elaine:
Jerry, you have tendencies. They're always annoying, but they were just tendencies. But now, if you can't kiss this girl, I'm afraid we're talking disorder.

Jerry:
Disorder?

Elaine:
And from disorder, you're a quirk or two away from full-on dementia.

Jerry:
[thoughtful] Hmm, that could hurt me.