Few Party Games are so well known and liked as Beer Pong (a.k.a. Beirut).  This game requires more skill than luck.  
 
"If you sink it, they drink it"  Technically this is known as a drinking game (alcohol not included) but it can also be played with water, or NO DRINKING at all, which is just as fun.  Water Pong is great for all ages!  We've had 5yr olds and grandparents playing this game together and absolutely loving it!
 
Basic Rules:
1 v. 1 OR 2 v. 2
-10 cups are set up on each side in a triangle shape
-Each teammate shoots once (2 balls per round) trying to get the pong ball into a cup
-If a ball lands in a cup, that cup is removed 
-Teams are allowed 1 re-rack per game
-The first team to illiminate all of their cups Wins