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 :
The main characters of the first three seasons were Prue (Shannen Doherty), Piper (Holly Marie Combs) and Phoebe Halliwell (Alyssa Milano). After Doherty departed from the series in 2001, resulting in her character's death, she was replaced by Rose McGowan as the long-lost fourth sister Paige Matthews.elthazor, played by Michael Bailey Smith, is a red-and-black-skinned demon who made his first appearance during the season three episode Once Upon a Time. He is the demonic form of Cole Turner (Julian McMahon), a half-human and half-demon who was hired by The Triad to kill The Charmed Ones.