Ugh: Very underrated episode, enjoyed it thoroughly. The gags are good.
Doing Time: Always forget this one exists, like you do. Nothing special, and that ending... -_-
Ripped Pants: Mediocre for me, the song's the only good part IMO. And that beginning part with SB and Sandy was pretty sweet.
MuscleBob: Alright episode, too forgettable. No memorable jokes or quotes (Although that commercial was pretty funny) here, and the episode it's paired with ("Squidward the Unfriendly Ghost") is much better than this one.