The tape trick

So, I read on a photography board that one way to get a picture of a moving child is to plop them down and then put a piece of scotch tape in their hand. Apparently, they'll be so busy trying to figure out how to get the tape off that they forget to crawl away.
Well, in Jack's case, he just ate the tape. I was able to get it out of his mouth before it went down...but not before I got a couple of cute shots. Here's one: