Chris Johnson Twitch Video?

I was told Chris Johnson have a disease because of his twitch.
Not trying to make a joke or anything, just curious because people say he always seems to be twitching... there's a video that proves it.
Is football player Chris Johnson known to have a twitch? Do you know where can I see the video?

I could be wrong, but I remember somebody saying after the Titans drafted him that Chris Johnson had spinal surgery when he was a kid, and has had this twitch ever since.
And also I read somewhere that Chris Johnson does have Tourrette's Syndrome. I wish I could find the source of that info.
Here's the video of Chris Johnson's

I can't find one where he's twitching

Go to nfl.com and look for the interview between Johnson and Michelle Beisner. You don't really notice it at first glance but it caught my eye. I wasn't even sure if I was just imagining it so I googled it to see if anyone else saw the same thing

http://www.youtube.com/watch?v=aZfLadnp1sM

Look closely at the end

1:53 to be exact.

Are you serious? You didn't even post the video where he twitched.

I've been looking for it for quite some time now.