"No I am not Booster"

Last night, we were out front saying goodbye to some friends.  I had told Mackenzie to get off McKay's bike.  She turned and looked and me and said, "why" to which I said, because it is McKay's bike and I told you to get off.  She kept riding.  Under my breath I said "oh, she is in big trouble"  McKay must have heard because he yells to her, "you are in big trouble missy"  to whish she yells back "no I am not booster".  McKay comes over to me (I had heard the whole thing) and says, "she called me booster"  I started to laugh.  He did not think that it was funny.  He stormed into the house while I was trying to stop laughing.  He came back out and I told him that I was laughing not at him, but that Mackenzie called him a car seat.  He laughed, just a little bit, but still did not like being called any names.  What a way to say good bye to your friends huh!!!  I had to save this.  It was too funny!!