-knock on wood
-find a four-leaf clover
-grab some garlic to keep away evil spirits & vampires
-wear clothes inside out
-wear your birthstone
-make a wish, get the longer part of a broken wishbone by breaking it with another person
-have an itchy palm so money will come your way
-put a cricket in your house
-keep a lock of a baby's first haircut
-make the bottom of your feet itch to go on a trip
-find a penny that's heads up
-get out of your bed the same side you came in
So do all of those stuff, you'll probably have good luck today!