Make a Wish!

A wishbone, or as some call it in the British Isles, "a merrythought" is a bone overlying the breastbone of fowl, typically the chicken and the turkey.  In some places it is customary to remove this bone intact when carving the bird.  It is then well-dried until it is brittle.

The wishbone is then given to two people, oftentimes children, who face each other while each pulling one end until it breaks, each one making a wish while doing so. The person who  ends up with the longest piece of the wishbone will supposedly have their wish come true. If the wishbone breaks evenly, it is said that the wishes of both contestants will come true.