I’ve lived and traveled abroad and absorbed an eclectic set of superstitions.
From Japan:
– Don’t kill a spider or it’ll rain.
– Clean the entire house (really deep/detailed cleaning) before New Year’s Eve so that you will have good luck in the new year.
– On Setsubun (Feb. 3rd) banish demons (bad luck) from the house for a year by throwing adzuki beans out the front door and saying: “Oni wa soto, fuku wa uchi” (“Demons outside, good luck inside”).

From Latin America:
– Never let your purse touch the floor – if you do “money will fly out” (it’s bad luck to your financial well-being. You’ll earn less or some unexpected expense will crop up).

From my childhood:
– When passing under a train trestle (the road under a train track) when a train is actively passing above you cross your fingers, kiss them, touch the roof of the car and can make a wish.

- From China:
You should shave all the baby’s hair at age one month.(This hair is considered to be the hair that “came from the womb”.) This will give the child good looks / lovely hair for the rest of his or her life. (I’ve had many Chinese friends forcefully say I must do this.)

What superstitions do you believe or follow?