Here's a few from the book, that I myself do:
preserving the pointy tip
Whenever i use the fat Crayola markers, and only those particular markers, i feel bad if i press hard. it just seems like the whole marker’s life is ruined and it will be scarred for life if the tip of the marker is not pointy. so when i use those markers, i try not to press hard so they maintain a nice point.
pill confusion
I get really uncomfortable if I swallow two different pills at once. If they are the same medicine, I can take several at a time, but if they are different, I feel as if I have to take them one after the other, or else they might get confused.
i'll have what they're having
Whenever I go eat with friends, I wait to see what they’re getting before I make a choice. If they’re getting deep-fried this or greasy that, so will I. If they’re getting health food, so will I, even though I hate it. Otherwise I’m scared that they’ll think I’m a disgusting glutton.
gmail is tricky
When I send an e-mail I always have to go into the Sent Items and re-read the message I just sent, just to reassure myself that it still reads the way it did when I sent it a few seconds earlier.
There are quite a few more, but I'm too lazy to post the rest.