If you see a black cat and it crosses your path it's bad luck.
If you walk under a ladder it's bad luck.
If you break a mirror it's 7 years bad luck.
If you step on a crack you break your mother's back..which I would imagine is bad luck..LOL
Opening an umbrella indoors is bad luck.
Breaking a wishbone and getting the long side is good luck (finally! lol)
Crickets in the house are lucky.
If you hold a buttercup under your chin and you see yellow, you like butter, which is good...?
"Find a penny, pick it up, and then all day you'll have good luck." But then there's also, head up = good luck and tails = bad, so I always amended for my own clarification that a heads-up penny was good luck and a tails-up penny was well, 1 cent.
My wishing favorite: I was taught as a kid "Star light, star bright, very first star I see tonight. I wish I may, I wish I might, have this wish I wish tonight."..but you can't tell anyone what you wished for or it won't come true.
My weather favorite: My Gram used to say: "Red at night, sailor's delight. Red in the morning, sailor's warning."
My creepy favorite: If you shiver or get a sudden chill someone's stepped on your grave.
I had no idea I had all this stuff rattling around in my head until I started thinking about it! LOL