What childhood adage or diddy do you remember?

As I pumped gas into my car this morning, I glanced down and noticed a penny lying on the ground. The first thought that ran through my mind was a childhood adage.

Do you remember "Find a penny, pick it up, all day long you'll have good luck"? Do you pick it up?

Do you ever take an evening stroll and find yourself avoiding cracks in the sidewalk? Is it because of the phrase "Step on a crack, break your mother's back"?

What other childhood sayings do you remember? Which ones do you swear are true?