My parents may have given me a few, but my grandparents were the main culprits.
Don't smile at wooly caterpillars, if they count your teeth, your teeth will fall out.(My brother and I would go show them to my grandparents with our lips covering our teeth, trying to tell them we found a wooly caterpillar)
If your knees were ticklish it meant you like girls/boys.
Dont play with fire or you'll pee the bed.
Edited to add: Raise your feet when you go over a bridge, to make the car lighter. Otherwise, we'd fall through.
Edited by B Randomly, 06 September 2012 - 10:25 PM.