Where did she learn this?

Maddie has started a very silly/cute/mischievous stage in the last two weeks. She does some of the cutest things but I caught her on video today!! In the video, she has a container of "puffs" and has somehow learned to open the container with her mouth. I have no idea if she's seen someone else do this or if she figured it out on her own but it's quite funny to watch. The little dance she does in this video gives me a good laugh too!