1. i always check the front door is locked before going to bed, even though i never forget to lock it when coming in, i've never found it unlocked
2. i'm always double (maybe triple and sometimes more) checking that i wrote the correct numbers down for bills, account numbers, check deposits, phone numbers, etc
3. i'm a stickler for instructions and will follow it to a tee and am too careful to make sure that it's done correctly the first time, to the point that i do things very slowly...rebates, assembly instructions, electronic devices/hookups, etc.
probably more that i can't think of right now...
added:
4. always pee before bed, even if i don't have to go
5. when out to the movies, i always pee before a movie starts even if i don't have to go, and i always worry about the urge coming during the movie
6. always checking for my wallet, even though i know it's in my pocket, i nonchalantly brush my hand (or arm if i'm sitting) across it to feel it's still there, sometime i'll nonchalantly move my leg a certain way (ie: shake, bend, etc) my leg to feel the weight of my wallet
7. when placing or building things and i need to be do some centering, instead of just placing it and looking, i'll tape measure it (ie: table, wall hangings, surface areas, etc) and divide it