Select 3 youths to be out of earshot.
Explain to the rest of the youth that when the first youth player(a) comes back in the room that he/she player(a) will be judging who can moo the loudest. Everyone is then told to moo as loud as possible 3 times.
After the third time, the player (a) will select who Moooooed the loudest. The person player (a) selects can be given a reward (candy) by a player (a). Once the player (a) makes the selection player (a) sits down and the person selected becomes the judge.
Everyone then will moo for the new judge 2 times as loud as possible. Here is the rub… player (a) doesn’t know that on the third try no one will moo. So on the third time, he/she will be the only one that moo’s.
IF it works everyone will laugh including the victim. At that point, somebody goes out to collect the next victim.