From the season 3 (1991-92) episode, I Married Marge:

Smithers: What would each of you say is your worst quality? Man 1: Well, I am a workaholic. Man 2: I push myself too hard. Homer: Well, it takes me a long time to learn anything, I’m kind of a goof-off… Smithers: Okay, that’ll do. Homer: … a little stuff starts disappearing from the workplace… Smithers: That’s enough!

Matt Groening should sue.