Some motorcycle enthusiasts hang a biker's bell from a portion of their bike to protect themselves from evil road spirits.
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)
A single magpie is considered a sign of bad luck. A Guide to the Scientific Knowledge of Things Familiar recites an old proverb concerning the incidence of bad weather when magpies forage alone and a possible scientific explanation for this.
According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
Placing a hat on the bed is, apparently, bad luck. (South Carolina)
Placing keys on a table is considered unlucky. (Sweden)