child proof doors

We have the child proof lock on our car doors. The kids know that an adult has to open it for them. Well, a while ago, Bailey wanted to open the door for Lex and Nate. I should mention here that Lex finds it *hilarious* to quickly lock the door as we are about to open it. So, as Bailey goes to open the door, Lex locks it. Bailey looked at me and said, "Huh, that's a pretty smart car. It even knows when a child is going to open it from the outside." I wanted to laugh hysterically at this! But, I kept my cool and said, "you're right, that's why adults open the doors for you." The things kids say...