Well, besides the implausibility of 3PO's head and body to be able to work independently of one another, I think that whole premise might have been humorous if not for the atrocious lines of dialogue they had him say during it. Complain all you want to about Anakin and Padme, the really horribly scriptwriting in that movie is definitely directed at that poor droid: "I'm scrap!" "I'm quite beside myself!" "This is such a drag!" Ugh! Made me wonder if they were trying to make the audience groan. So pathetically written, so forced at humor, so out of character, and so out of universe when you start throwing in pop culture slang! The only two one-liners I actually enjoyed were, "I'm so confused!" and, to a slightly lesser degree, "I'm programmed for etiquette, not destruction!"