Back when she was just shy of her one year birthday, Sadie was doing her 'first joke'. You can read that post and watch that video on the blog here . Well...fast-forward a few years and she's still at it - being a jokester. Here's a video of Nat working with her on how to pull off a 'knock-knock' joke. Not sure she *quite* gets the idea. But...she sure does crack herself up! ( For those of you reading this in your email and can't see the video below, you can click here to watch the video . )