This is a game called the Elements Game. First, this game is much like the game we all know as Rock Paper Scissors but in element form. I will tell you what wins against what by telling you now:

Air>Fire, Air<Water, Air<Earth

Fire<Air, Fire>Water, Fire<Earth

Water>Air, Water<Fire, Water>Earth 

Earth>Air, Earth>Fire, Earth<Water 

How to make Air with your hands; You point your finger down and make like a hurricane. 

How to make Water with your hands; You make a wave with your hands.

How to make fire; You put your palm face up and create your fingers in a fire motion.

How to make Earth; You make a fist like a rock.

If you lose the winner is allowed to hit your forehead with their middle finger + thumb in a snapping motion. 

Happy Elements Games!