Also known as the kuru syndrome it causes you to shake uncontrollably and causes you to burst out laughing
discovered in 1980 when a group of french-Canadian lumberjacks began screaming and jumping uncontrollably and they would laugh like schoolgirls but worst they would do anything they were told uncontrollably. Scientists think the "disease" is environmental, genetic, or psychological.
So that when I flex, the hula girl dances. And when I do the hula the muscle flexes.
E.g. rubber bands as harps, pots and pans as drums, and toilet paper rolls as trumpets.