Playing a Joke on Mommy & Daddy

I never stopped to think that our little 15 month old could play a joke on her mommy and daddy...but last night she did! I dont know if this is a good thing or not, but Kristin loves to be scared. Not horrifying scared but like sneak up behind you and say "Boo!" scared. She laughs and laughs. So Justin and I do that a lot to her. We will be washing dishes or cleaning up something and all of a sudden we jump and look at her and yell "Boo!" and she LOVES it! She cracks up every time and her eyes get huge, its adorable. Well last night while we were eating dinner, Kristin was really quiet and I didnt think much of it and all of sudden she jumps in her seat and yells "Boo!" at me and Justin! I could not stop laughing! It was the cutest thing I have seen her do yet and at the same time I was so amazed that she did that! I dont know why, I guess I just never expected my 15 month old to play a joke on her parents. But thats the best first joke ever!