This rule either allows players to "finger" the ball out:
◊ Once the ball enters the beer pong cup
◊ Before the ball hits the liquid
If this rule is in play, the player can use their index finger to "pop" the ball out if it is spinning around the cup. By blowing on the cup the air can hit the liquid and blow the beer pong ball out of the cup. If blowing is allowed then this is a legal move in the beer pong game.
Variations: "Guys Finger" - This means that only guys can finger the ball out, and girlss cannot. Works in conjunction with the
Blowing Rule.