...Four year olds do!!! This is for all you Primary Teachers out there who teach young children. It works amazingly!!! If you have any trouble at all keeping their attention during the lesson or "trying" to keep them quiet...PLEASE read on...
So what you do is, first, get enough clear plastic cups, one for each child. Then write each of their names on their cup. Visibly so that the child can clearly see which cup is theirs. Line the cups up on the table in front of the class. Begin teaching. Simple right? =)
As the children behave by sitting quietly, answering questions, reading along (depending on how old they are), drop a marshmallow in their cup. Believe me, after a couple children receive their "treat", the rest of them will be good the rest of the time. They start to realize how to get their treat and when they act reverently and participate, they see instant gratification. Works much better than the traditional, "If you behave we'll have treats after class." I know I have tried using this, works for about two minutes until they lose focus again. This way, they can see the direct results from their actions! Of course you don't have to use marshmallows, but we found it works well and not as much sugar...so the kids won't get so hyper like regular candy. I hope this helps and good luck!
I LOVE kids!! =D