Season 5, Episode 18: "The Raincoats"

ELAINE: Now, 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?

Don't you find that abnormal?

It is a tad askew.

I mean, they're your parents, and you don't do anything.