Not so much OCD as burgeoning mental health problems.
I went to an all boys religious school (waits for it.....).
Once a week we had chapel.
I fancied myself as a bit of a mind-control expert.
As a form of mass mind-control experimentation every week at chapel I would will people to either stand up or sit down during various parts of the proceedings.

Astoundingly at numerous time during chapel - the hymn, reading and prayers I managed to make (almost) the entire congregation either stand up, sit down or even kneel. The few who didn't were usually chastised by the teachers who I knew I could trust as my mind-control police.
Every week I managed these herculean mental feats with nary a victim even realizing that I was doing it too them. Isn't it lucky I used my powers for mundane and not evil? I often wonder how boring chapel must be without the random stand-up,sit-down sessions I had instigated.
Strangely the only side-effect I ever noticed was a weird "clicking" sound as I performed these incredible mental gymnastics.
(Misery McUglywife an attention seeking sociopathic fuckstain., Wed 21 Dec 2011, 20:55, Reply)