Seth was just on Aqua Teen Hunger Force

He played a character called Wayne "The Brain." The group was hanging out in a sports bar playing trivia, and they kept losing to Wayne. To make a long story short, Wayne, whose head was gigantic because of his oversized brain, created the whole bar with his mind. Anyway, it was pretty simple to tell it was him.

I saw it too. It sounded EXACTLY like Seth but I didn't see the credits. Was it really him?

Oh man, thanks for posting that, I heard that voice and immediately thought it was seth, but i didn't catch the credits!!