If an old woman you do not know asks you to fetch her a drink of water, do it.
If you find a penny heads, pick it up up and all the day you'll have good luck.
If you find a penny heads down, pick it up but give it to someone with a frown. Giving a penny found heads down is bad luck, but you reverse the bad luck by giving it to someone with a frown, thereby making them happy and changing bad luck to good.