A quirk is a peculiar behavioral habit like counting the stairs u walk..I suppose OCD could be considered quirky..it could also be a charming trait that makes a person stand out in a crowd.
When younger, I rode my unicycle everywhere.. also juggled. Alas, I couldn't do both at the same time. I got lots of attention. I still do those things, just not as well.
I check my doors to see if they're locked, even when I'm pretty sure they're locked already.
When all the lights are on, or when all the lights are off, I like the light switches that are right next to each other to be facing the same direction.
Like if they're all off, or all on, this should not be happening...