This is always the 1st lesson I teach year 7's upon arrival at secondary school. It gives you a great insight into their existing knowledge, it is accessible by nearly everyone, it's fun and they end up with a lovely desk name plate to help you learn their names and interests.
The resources can be found here, the script is very lengthy but well worth reading especially if your questioning skills need sharpening after the long summer break.
I wouldn't recommend showing the video to pupils as demonstrating and questioning at the front are the main parts of the lesson, I would strongly advice mastering the construction yourself before teaching the lesson.