What is this game where you throw a ball to make cups fall?

The game you're referring to is likely "Beer Pong." In this popular party game, players throw a ping pong ball across a table with the goal of landing the ball in one of several cups filled with beer or another beverage. Each time a ball successfully lands in a cup, the opposing team must drink the contents of that cup, and the cup is removed from the table. The game continues until one team eliminates all of the other team's cups.