I didn't know a lot of these that have been mentioned already!!
I never step on cracks (don't want a mother with a broken back!), and I always hold my breath when going thru a tunnel. I make a wish on the first star. I never tell my wishes. I raise my feet when going over railroad tracks, and hold a button when I'm going under a train.
I've always known that bad things would happen when I was 28 and that good things would happen in 2004. I was right on both. Probably a coincidence, because good things happened to me in 2008 and I didn't see that coming!