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 :
Clarence Clay Morrow was a fictional character in the FX television series Sons of Anarchy. He is played by Ron Perlman. He is the former International President of the Sons of Anarchy Motorcycle Club, but is also something of a vigilante as he does everything in his power to ensure that drug dealers and rapists stay out of his town.