Warren! He was the worst -- it's clear the show realized they made a big mistake in casting him, as he didn't even last one season, and Andy never had another deputy sidekick.
On another subject, one of the (unintentionally) funnier color episodes was when Howard got a swinging bachelor pad!
I smell Howard's feet whenever I see that episode.
BTW: I'm not sure, but I don't think Warren lasted more than 4 or 5 shows. Good riddance.