Seinfeld, Season 5

Elaine:
I know they're your parents Jerry, and they're very nice people. But don't you think it's odd, that a 35-year-old man is going to these lengths to see that someone else's parents are enjoying themselves? I mean, don't you find that abnormal?

Jerry:
It is a tad askew.

Elaine:
I mean they're your parents and you don't do anything. So why is this stranger doing it?

Jerry:
I've hardly been out to dinner with them.

Elaine:
See, see, I can't even say anything, you know, because all he's really doing is being nice. But nobody is this nice, this is like certifiably nice.

Jerry:
You're right. He's insane.