Placing a hat on the bed is, apparently, bad luck. (South Carolina)
9
Opening an umbrella indoors is said to result in 21 days of bad luck. Some traditions hold that it is only bad luck if the umbrella is placed over the head of someone while indoors.
75
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
Collect seven or nine different flowers on midsummer eve and place them under your pillow and it is said that you will dream of your future spouse. (Sweden)
463
According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
24
It is bad luck to put new shoes on a bed (or a table) (comes from the tradition of dressing a corpse in new clothes and shoes and laying them out so everyone can give their respects) - (UK)
57
It's bad luck to leave a house through a different door than the one used to come into it.
143
In some parts of England, rum is used to wash a baby's head for good luck.
71