I check, double check and sometimes triple check to make sure that doors & windows are locked (esp. in the basement at night!)
When I leave the house in the AM- I wait in the driveway to make sure that the garage door goes all the way down.
Everything in the closet is for the current season, lightest to darkest - left to right in like kind order (t shirts, skirts, pants) and then each season is rotated out to be replaced with the next season.
My silverware drawer is neatly organized, spices are in alpha order and pantry is in meal order (bkfst items on one shelf, lunch, dinner items on other shelves)
The dishwasher has to be loaded a certain way- DH is not allowed to load it because he puts the silverware in wrong side down and the glasses aren't lined up.
The bed has to be completely made before I will get into bed- if the bed isnt made and I climb in, I cant sleep.
I wont leave work until everything on my desk is put away.
I wont bring junk mail into my house - it immediately goes into the trash can.
I've been told that I am borderline OCD - but I like to think of it as particular!