There was a frontpage post about some Scotsmen with Tourettes, which set me to research...

And I'm not sure, but I suspect that I had Tourettes when I was younger, still have some vestiges. Up until I was about 18 I would occasionally become overpowered by this incredible 'pressure' building up inside of me that I would have to release by tightening every muscle in my body or by thrashing around or doing some such bizarre thing. Beyond that I would occasionally feel a tickling pressure in my throat that I could only deal with by saying words or phrases with a hard 'k' sound, or make rasping throat noises. There were a few others, but those are the ones that stick with me.

Most of these (for lack of a better word) compulsions have faded away with time, but I still have some bizarre ones. I'm compelled to mimic noises I hear around the world, I click with my tongue in rhythm to turn signals, whistle the windows noise when the computer shuts down , etc. And if I think about it a lot of my older ones come back. Does this describe Tourettes syndrome? It's not particularly disruptive, but it would nicely explain why sometimes I behave a little weirdly.