It's bad luck to leave a house through a different door than the one used to come into it.
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The superstitious symbolism of a black cat crossing one's path is dependent upon culture: some cultures consider this a sign of impending bad luck, while some cultures consider this a sign of impending good luck.
75
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
Placing keys on a table is considered unlucky. (Sweden)
3
Breaking a mirror is said to bring bad luck for 7 years. To "undo" this, take the shards of glass and bury them underneath the moonlight. In ancient times, the mirror was said to be a window to the viewer's soul. If that mirror were to break, it would
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Two people breaking a wishbone is said to lead to good luck for the person with the larger piece.
225
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
Before traveling a person should, apparently, sit on their luggage. (Russian)
117