Season 6, Episode 22: "The Diplomats Club"

-May I help you? -I'm the exterminator.

Oh, yes, of course. Come in.

Why didn't you want me to bring my equipment or wear my uniform?

Well, if the other people in the office saw that I had called an exterminator...

...they would just panic.

They're a jittery group.

Besides, this is sort of a friendly visit.

-Karl, right? -Do I know you?