Do it with your kids or without because you will be thoroughly amazed!
Clay came home from school and told me that he just HAD to show me this experiment they did. I was like waaaa?, when I saw what he was doing. But, it is totally cool and we're doing it again when his dad gets home.
Get a new, unused bar of soap, put it in a dish and stick it in the microwave for 5 minutes and watch in amazement...
There is air trapped inside soap. Heating it up like that makes all the air escape, taking the soap with it. It feels VERY weird afterwards!