Smarter than us all

Our little man is quickly becoming smarter than us, and it shows. He has figured out that if he tells one of us he can have something and we say no, he can turn around to the other parent and say "Mommy said I could have it" or "Daddy said to give it to me". How does a two year old understand how to pull off that kind of manipulation? He's just too smart already. We also don't help by laughing while we are being manipulated, we tend to turn things into a game around here...oh well, he's not printing fake ID's on the computer yet, so I guess we are ok for a couple more years :)