I tried to demonstrate crawling, since she seems to be having a little trouble with how to place her hands, but she giggled hysterically until she was incapable of even attempting to crawl, because of the spectacle of Mommy crawling back and forth around the living room. It was (apparently) hilarious to watch.
She has also become pretty fascinated with Grumpa's slippers. She spent a good five minutes yesterday trying to untie his shoelace (which actually isn't even a real shoelace. It's just a decorative tie).
I can't really imagine Sadie tearing around the room on her own, but I have feeling that we're only days away from that scenario. The cats aren't gong to be safe for very much longer.