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I just saw The Karate Kid, Part III again, and I'm pretty sure my teenage self disliked it because he was bored. As far as he was concerned, screen time without karate was screen time wasted, and by that measure KK3 wastes quite a bit of screen time indeed. Review of the Rifftrax here.
The latest Rifftrax short Vision in the Forest probably doesn't have karate either. It has a man in a bear suit, though, and that's almost as good. Grab it here.