Featuring Frank Zappa as the Pope.
Ren & Stimpy is available for purchase or streaming at Amazon, or on Netflix. Contrary to the title of the DVD set, the episodes are not uncut; most notably the entire Bloody Head Fairy sequence is missing from Haunted House. This episode, however, is intact and is not the cut-up version shown on Nickelodeon.
(I'm not sure about the streaming versions but have no reason to think they'd be any different from the DVD release.)
Anyway. Zappa loved oddball cartoons, so he fits right in here.
And I'm sure one of these days I'll get to Duckman...