I will not use gas pump #13, furthermore I will not put 13 gallons of gas in a car, or $13 dollars worth. I will not check out through checkout aisle #13. I will not have the volume at 13 on any device. I will not go to bed, get up, or leave the house on any time of day that ends w/13. (yes there seems to be a theme here)
I also count how many swipes I make with deodorant.
Also after every shower when I turn the shower off the excess water that runs out the bathtub spout for that brief moment, I have to stick each foot under that stream of water (one at a time). If for some reason I fail to do this, I will turn the shower back on, turn it back off and do it before I get out.