1,2,3,4
Counting, or more specifically, counting to four. I've done this since childhood - counting paving slabs as I walked to school and it's progressed into adulthood but now I count either cars that I drive past or lamp-posts but they always have to be evenly spread - either two on the left/two on the right or four on the right/left.
I'll speed up and slow down just to ensure this happens - if it doesn't I'll tweak the criteria - shutting my right or left eye so I don't see the offending vehicle - my game my rules.

I didn't know this was OCD behaviour until I was in my late teens when discussing this with others apparently singled me out as a mentalist but to be honest I quite like it - it passes the time on long car journeys.

Oh and one other slightly related point - assymetry drives me potty - I don't care if Cameron Diaz and Angelina Jolie were offering me a menage-a-trois (what? it could happen!)- if they were wearing assymetrical dresses it would just make me itchy.
(lopezthecatkiller has not killed a cat since....., Thu 1 Jul 2010, 15:40, 8 replies)

I have a semi similar thing
with street lights, there always has to be the same number on each side of the road and none missing on 1 side so you get 2 in a row on one side but none in between them on the other side.
(libman, Thu 1 Jul 2010, 15:47, closed)

And if that isn't the case?
Does it make you feel uneasy? - it does me so that's why I cheat - like I said - my game my rules
(lopezthecatkiller has not killed a cat since....., Thu 1 Jul 2010, 15:52, closed)

surely
CD and her mirror-image clone; or AJ likewise.
Otherwise you'd never properly symmetrize the situation.

Important note: under no circumstances should you allow yourself to realise that you yourself are asymmetric.
(haberman is singing in the changes, Thu 1 Jul 2010, 15:55, closed)

What?..er..
Damn - I guess that's the reason (and the only concievable reason) why this scenario hasn't happened yet - CD and AJ don't want to make me itchy.

And no I'm not asymmetric - I'm one half of identical conjoined twins - we share a foreskin.
(lopezthecatkiller has not killed a cat since....., Thu 1 Jul 2010, 17:24, closed)

Well, you're certainly chiral
So stop worrying.
(Shippy likes linebreaks and doesn't care what you think, Fri 2 Jul 2010, 22:28, closed)

Thanks - that's put my mind at rest
*googles chiral??*
(lopezthecatkiller has not killed a cat since....., Sat 3 Jul 2010, 13:45, closed)

I'm like that to fives.
Not so much nowadays though. It used to be worse. Does this make us enemies? Five sentences with five words.
( Foxglove -- it all ends in tears anyway..., Thu 1 Jul 2010, 16:09, closed)

I guess it does.
Who counts to five? Are you a mentalist? Be normal like me.
(lopezthecatkiller has not killed a cat since....., Thu 1 Jul 2010, 17:16, closed)