Don't worry, I think we're all with you on that one.
The only critisism i would offer, and it is a slight one, is that they use the same jokes every time in the marshal brief. The briefs are very good, they explain the rules and safety clearly and I have been to places that have not been as thorough as NPF. Taking groups there several times a term I think i know it off by heart now.
The one about the de-misting spray and the contact lenses.