I do the “bread & butter” thing. It’s ingrained and I don’t think I could stop even if I wanted to.
I don’t do the ‘knock/touch wood’ for prevention against bad luck, but I do have to rub my left palm against some wood if it itches (left palm = loss of money; right palm = coming into money, rubbing on wood ‘erases’ the loss).
I also can not pick up scissors if I drop them. It’s bad luck to pick them up yourself. It’s also bad luck to pick up a penny that is tails up.
No shoes on the table, or hats on the bed. Shoes on the table, I believe means you won’t get married for a year (too lazy to look up, but that is what I remember) and hats on beds mean death (in the family?).
Heh, that’s just how the universe works! I know lots of cops who are completely superstitious about this, seemingly for good reason. Just the other night, the sweet little rookie cop in the town where I work dropped in to chit chat… made the observation that it was really slow for a Saturday night. I didn’t see him anymore that night, except running code over and over again past the hotel, until daylight. Called him after his shift, and 'splained that he had jinxed himself!
Otherwise, I do knock wood and say bless you, mostly out of habit. I don’t think I have any other real superstitions or superstitious habits.
I don’t eat the last M&M in a jar or large bag. (Eating the last one in a 2 oz. bag is OK.) This is because whoever eats this last M&M will die in a short time (e.g., within a couple of weeks).
Whenever I play Battleship, I NEVER put any of my boats on the B row (not even the boats I position vertically).