Does Anyone Else Experience Twitching?

Whenever I give a slight punch on certain parts of my body, thighs for instance, I get at least one "answering" twitch. I know it's not the smartest thing to do but does it sound familiar to anyone of you?
 
For me lying down on the muscle like rolling over and switching shoulders will trigger one or two twitches on the shoulder being pressed against.
 

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