At our house it was:
No hats on the bed. To this day, I won't put a hat on a bed.
No walking in the house with only one shoe on. I can't say I follow that one.
Don't give someone the gift of a knife without also giving them some money. Otherwise, they will cut themselves with the knife. I get around that one by not giving anyone the gift of a knife.
Don't give someone a purse without at least one coin in it. Bad luck otherwise. I'll put a penny in a purse I'm giving to charity....silly, I know.
My great-grandmother always tied a knot in the corner of a bedsheet if she heard a owl calling. A death in the family otherwise.
Grandma believed that if you dropped a spoon on the floor, a woman was going to visit next. If it was a fork, then it would be a man. I can't remember what a knife represented. Heaven knows who's walking through the door if you drop a can opener or a whisk. Aliens?
Don't whistle before nine or you'll cry by noon. I whistle all the time; I'm really in trouble. My very proper great-aunt was quite upset when I learned to whistle as a young child; she was convinced that whistling women come to no good. The jury's still out on that. She got a tattoo when she was 18......I at least waited until I was 60.
From my late husband's family: if you say Jesus Mary Joseph 1000 times between noon and three on Good Friday, your worst sin will be forgiven.
I imagine we'd never run out of superstitions and legends that people have heard from their families.