He won't do that again

I guess it is one of those lessons that my son really wanted to find out for himself. He just didn't believe my husband or myself. Granted, he doesn't see the iron very often because I could theoretically work in my pajamas so I don't really own many clothes that require anything more than prompt removal from the dryer. I do have one pair of pants that like to wrinkle if you even threaten to wash them. I decided to wear them to a BBQ yesterday afternoon, which meant I would have to iron them. Out came the ironing board and iron. Son said he wanted to sit on my bed and watch me de-wrinkle my pants. I said that was fine. He kept asking if the iron was hot, and how hot is the iron, and on and on. I told him he needed to stay away from it because it is very, very hot and could badly hurt him.
My husband entered the room and we started to talk while I toiled. My son got off the bed and asked again how hot the iron was (I'm going to take him to the doctor Monday to test for brain damange) and my husband and I both said, it's very hot, just don't touch it -- we were both getting a little annoyed. The kid, didn't seem to believe us because he made like he was going to walk out of the room and then he quickly backtracked and held out his hand and grabbed the iron before I could stop him.
Of course, there was much screaming. I know it must have hurt like hell and he definitely wasn't expecting pain like that. We held off on the lectures and raced him to the kitchen to put his hand under cold water. However, since we have a flat roof and our pipes are on the roof, there was no freakin cold water coming out of the faucet -- it takes a few minutes.
I grabbed some ice cubes, threw them in a pick cup of water and put his hand in there.
It wasn't a bad burn.. but it did leave a little blister and hopefully a painful memory for the child.