Here's a classroom game I learnt last week.
Pick 2 kids. Stand them 5 meters apart at the front of the room. One has to say 'silly' and the other has to respond with 'sausage'. Then they take a step closer to eachother. They say the words again and again stepping closer and closer until one of them laughs. The first kid to smile or laugh is out. He/she is replaced with another child until everyone has had a turn or you've run out of time. The overall winner is the kid who was in for the longest.
It's lots of fun.
I'd be thankful if someone could justify it with an educational purpose.