I played someone once who needed to set up a little shrine of very small stuffed animals and various nicknacks before the lag. It was a careful, serious arrangement. They were all at a height where they could supervise the table, too, and I did feel like flipping them all off a few times- just because they were there.
Used to have some lucky argyle socks, but they eventually failed me.
Not quite superstitions, but I do have some preferences:
--I like a certain shape/ depth of chalk.
--I like at least two chalks at the table (I hate when the opponent wants to chalk while you shoot, and you have to keep asking them for it).
--I prefer not to be the white bead on the wire.
If I have to wait for another person on an adjacent table to take a shot before I can take mine, I used to feel superstitious about their performance. If they made the shot, I'd know that mine would go, too. Now, though, if they miss their shot, I just keep it as a reminder and a conviction that I must focus better than they did and make sure mine goes.
Last superstition: no purses on the floor. That's bad luck- it means you don't care about money and it will flow away from you. However, under the pool table is super secret safety ground and it doesn't count.
