Placing a hat on the bed is, apparently, bad luck. (South Carolina)
If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
An acorn at the window will keep lightning out
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)
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
Many believe that if all of the candles on a birthday cake are blown out with one breath, while making a silent wish, the wish will come true.
Before traveling a person should, apparently, sit on their luggage. (Russian)
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.