I know you aren't superstitious. You don't stay in bed on Friday the Thirteenth. You walk under a ladder without thinking twice about it. (Perhaps you should think twice though; a bucket of paint may fall on your head.)
But not everybody else is as clever as you. Why, there may be children in your own class who believe superstitions like these:
That part of your soul is caught in a picture of you. Primitive people sometimes refuse to have their photograph taken, for fear that it can be used to bewitch them.
That a pinch of salt thrown over the left shoulder will protect you from bad luck. It is supposed to keep the devil at a distance. And if salt is spilled, there will be a quarrel.
That bubbles in coffee mean money, while bubbles in a teacup mean visitors are coming. (A sudden itch, or silverware falling to the floor, also is a sign of visitors.)
That if your ears burn, someone is talking about you.
That if you step on a crack, you will fail at something you are trying to do.
That it is bad luck to break a mirror, postpone a wedding, or open an umbrella indoors. (Or for that matter, to turn back from a journey, stub a toe, wear clothes inside out, meet a funeral procession, sit on a table, or leave a house through a window.)
That it is good luck to possess a rabbit's foot or horseshoe, find a four-leaf clover, meet a black cat or pick up a pin.
That fairies, elves, and sprites help human beings, while gnomes and goblins are full of mischief, causing milk to sour and even stealing babies and leaving changelings in their place.
Of course, you don't believe such nonsense. Just to make sure that nothing bad happens, though, it might be a good idea to touch wood.