Well, a busy two days running FireBrick courses, and I have to say that Jon gave me a run for my (his) money.
Probably the first time I have had a "me" on one of my courses! I must be a nightmare to train me!
He was always one step ahead of everyone else, and at least two slides ahead of the presentation, whilst always checking his emails.
That said, I like this - made the course a lot more fun, and a hell of a lot of suggestions and even bugs/typos found as a result, which is excellent.
It was a pleasure to do a course for someone that knew his stuff, and was there to learn.