The pie metaphor.
Right. So the guy from the other team is called a "bowler" and he's trying to knock your pies down before you can eat them. He throws with an overhand motion, releasing the ball before he steps into the crease, usually bouncing the ball on the ground to make it harder for the pie-eater to pick up. To protect your pies, you have a bat, and when he throws the ball, you swing the bat and try to swat the ball away. If you hit it, you and the other pie-eater switch places and then you can eat one of his pies.
The rules of cricket explained No. 2:
"When a man goes out to go in, the men who are out try to get him out, and when he is out, he goes in and the next man in goes out and goes in. There are two men called umpires who are out all the time, and they decide when the men who are in are out. When both sides have been in and all the men have been out, and both sides have been out twice after all the men have been in, including those who are not out, that is the end of the game.