How come “ALF’s” fingers are always “twittering” around and moving?

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Did the actor who played him have like a disorder or something?
Filed under: twittering
To make ALF more alive, the puppeteer needed to show constant movement. If ALF would have just been on screen without doing anything, then it would have been too much of a puppet and we wouldn’t have accepted it as an actor in the show–it would have just been another prop.
Alf is on meth. Why do you think he gets the munchies for cats