In 1980 Alberca et al. described a patient with a syndrome of increased muscle irritability, who presented ondulating muscle rolling movements and electrically silent cramps, myoedema and muscle reactions to mechanical stimulation similar to myotonic response, suggesting a disfunction at myofibrillar level.
For c-3po, it was a costume, Anthony Daniels played c-3po: For R2-D2, It was a costume and a remote controlled robot. CGI was also used in the prequel trilogy. So, they had Kenny Baker to play him : And from Portrayal section of wookieepedia article on R2-D2 :
Among those exiled to Storybrooke is Geppetto, an elderly carpenter who, according to the popular fairy tale, carved himself a son named Pinocchio out of magical wood. Veteran stage, feature film and TV actor Tony Amendola, who plays Geppetto, was delighted to venture into this âfracturedâ TV fairy tale world. âI read the pilot script for Once Upon a Time and thought, âWow, this is really wonderful,ââ says the actor.