From Joe K.

I guess my claim to fame, if you want to call it that, was that I worked on the very first Beavis and Butthead cartoon. Yeah, I did. I was a cel painter (we weren’t using computers in those days, Sonny).

Don’t tell Mike Judge this, but I painted the cels he gave me to paint at work on my break. I was a server (we called ‘em “waiters” back then, Sonny). I sat at a table in the dining room trying not to get spaghetti sauce on what I thought was the worst thing I’d ever seen drawn in my entire life.

…until I saw him on David Letterman a very short time thereafter.

Scroll ahead to the most important part (ha ha): my credit, at 2:40.