Balloon Keep It Up
Break the guests into groups of 4to 5 people and let them know they are going to be bouncing a balloon back and forth. Sounds easy enough. Then tell them that the balloon must always be hit from the bottom and always be hit upwards. If you let the balloon hit the ground the person who's turn it was is out, if the person hits the balloon with the wrong body part they are out. This game is played in rounds, so once a groups balloon hits the ground, they stop until all the groups have finished.
Ok - The fun part as they play this game - One person (adult) calls out the body part by which the next person must the balloon with: Examples: Hands, feet and knee are easy ones, but elbow, head, and hips/butt make the game harder. Take the winners of the first round and have them play off or continue until there is a one winner. Silly but fun.
Alter as needed for your age group.
Click this animated image!