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If you offer Goober a cig as he's leaving the clinic after a performance, the game can freeze (he's already out the door while Kathy's trying to talk to him).

Possibly other items to I guess, but that's the only one I tried it with before figuring out the puzzle, so make sure he's still in the middle of a performance before using items on him, or have a recent save (autosave bailed me out here as I hadn't saved in a while).
Post edited May 07, 2016 by ZarkonDrule
Thanks for the bug report, we will take care of this in the upcoming patch!
This issue has now been patched!
Cool. Had a lot of fun with this game, hope there's a sequel. :)