Casey Neistat

I've always been an incredibly physically capable human being. I've always had good control of my body, walk a hundred feet on my hands, jump off rock wall and do a back flip into the sand. That's always been who I am.

Sometimes it's even hard to tell the difference between a tic and a compulsion. But while tics stem from an urge in a specific part of the body - either completely unconsciously or through a premonitory sensation that's satisfied only by the tic - OCD bubbles up as conscious thoughts in the mind.