EDIT:
Thanks to the comments below I've made the following changes to the cartoon:
- Longer establishing shot at start.
- Bit more of a gap before the instructor shouts, 'NOW!'
- Voices are a little louder (not much, but there's a difference).
The link to the newer version is here: http://www.youtube.com/watch?v=XvKpSv10MVE (not that anyone has to look, but by all means, tell me I've got it all wrong)
Cheers for everyone's help so far
Yac