To open the service, I told the kids that I'd been working with their parents the previous week to help them overcome a fear that they'd all been confiding in me. The kids were baited!
I then introduced this video about all parents having a fear of the messy room. I'd spent some time the week before (with the participation of parents) obtaining video footage of kids rooms while they were at school. I compiled this video and the kids were so surprised to look up and see their own bedrooms and me in some of them. It was pretty funny.
This was a great way to introduce the subject of the day and the kids were caught off guard by the element of surprise.
You can see the video here: Messy Room Video