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My family tends to believe in some crazy stuff-
like don't spill the salt, don't put your handbag on the floor, and don't put scissors on the bed. Now, these actions maybe be normal, but the end result if you do any of these actions is a bit ridiculous. For example,

if you pass a black cat, it means death
if you put your bag on the floor, you will lose money in your near future.
if you place a pair of scissors on your bed, they will come to life and try slicing your butt.
if you sleep under a full moon, you will end up with black marks on your face (beauty marks)

I literally can go on forever (my family also believe's that are related to witches back in Spain), but tell me some of yours. xd