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  Dreams go by opposites (what you dream is the opposite of what will happen)

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  Knocking on wood prevents jinxing or bad luck

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  Finding a four-leaf clover brings good luck

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  Seeing a black cat is believed to bring bad luck

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  Friday the 13th is considered an unlucky day

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  Making a wish on a wishbone, with the larger piece granting your wish

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  Opening an umbrella indoors brings bad luck

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  Making the sign of the cross three times can counteract bad luck if you enter a room with your left foot

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  Some Spaniards buy lottery tickets only from places where big prizes have previously been won, believing luck will strike again

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  Some believe you should not give yellow clothes as a gift to a baby, as it brings the evil eye