a ladder
If you walk under a ladder, you will be unlucky or may die soon.
a horseshoe
You will always be lucky if you hang a horseshoe over your door.
whistle indoors
If you whistle indoors ,you will be poor
break a mirror
If you break a mirror,you will have seven years of bad luck.
an umbrella
If you open an umbrella indoors, you will be unlucky soon.
drop a fork
If you drop a fork,a man will come to visit you
a bird
If a bird flies into your house, someone will die.
a black cat
If a black cat crosses your way, it will bring you bad luck.
a bird poops
If a bird poops on you,you will come into some money
catch falling leaves
If you catch falling leaves in autumn, you will have good luck. Every leaf means a lucky month next year.
make a wish
If you make a wish, then blow out all the candles on your birthday cake in one blow, it will come true.