Season 6, Episode 12: "The Label Maker"

You don't have the label maker, do you?

-No. -I knew it.

-You're a re-gifter. -Oh, yeah. Some gift.

-That thing didn't work at all. -What?

You put a label on something, 10 minutes later it would peel off.

It was the worst gift I ever got.

Well, I bought it for you...

...because you were so nice to me for not charging me for the dental work.