I dropped by Art All Night in DC and loved this installation titled "Seen Unseen" by Christie Malvin:
It's a mixture of projected silhouettes of passers-by combined with live skateboarders skating between the projector and the canvas.
And then I bought a friend's kid a plush Cookie Monster, and I couldn't help resist having him star in a video first:
It took me a while to clean all the cookie bits out of his mouth afterward. :P