In arguably the greatest gaming series of all time, The Legend of Zelda, one of the core weapons is based solely off of physics: The boomerang. The boomerang is used to kill enemies, retrieve items and rupees, and best of all can be used infinitely due to the fact that it always comes back to you. The key to a boomerang returning to the thrower is a phenomenon known as gyroscopic procession. This is where one wing is moving through the air slightly faster than the other, creating unbalanced forces. As the top wing is spinning forward, the lift force on that wing is greater and resulting in differing forces that gradually turn the boomerang. This causes it to loop around in a circle, and return to the thrower.