The shower guests are given a piece of paper that is like a Bingo card. Everyone fills in each square with an item that they think will be given as a gift. You can guess about the basics that people get, or consider the registry. As the bride opens her presents, the 1st person to get all things listed in 1 row wins! (The rules can vary to different patterns if that is establised ahead of time) & just like in the game....They Yell BINGO! & a prize is handed to the winner. It's a fun way to get people involved in what they brought & sharing in the Surprise!