Re: National Geographic: Strange Behaviour
I thought the same about the Tourette syndrome. I was like no way, this guy has to be pretending! How can you not control obscene language etc? But then I browsed around a bit and realised it’s very real. No one would want to become a social outcast or put themselves in highly embarrassing/dangerous situations on purpose.
I don’t think that’s a syndrome of any sort. 
People do weird things when they’re nervous like shake their leg, bite their nails, grind their teeth, twist their hair… You only have something to worry about if you have an urge to pull your hair for no reason and if you have no control over it.