Klinger and Frank pass each other in the entrance to the Swamp. Frank gives a disgusted look.

Klinger [grandly]: I wore this with just you in mind.
Frank: You make me want to throw up!
Klinger [happily, to everyone else]: See, it pays to dress.

Season 5, Episode 4, “Out of Sight, Out of Mind,” the one where Hawkeye is temporarily blinded. Halfway through season 4 it began to feel a lot less funny to me, but Jamie Farr still makes me laugh.