When I was a GM, I did a large nonlinear quest which was about 200 hours of playtime long. After I finished I threw together a bunch of easter eggs. One of which was a crudely drawn MS Paint "Quest Book" which vaguely detailed the plot of the quest, but in a manner that would be extremely confusing to anyone who didn't participate.
Regardless, it's still mildly amusing to me. I just reupped it to my site.
It also contains a plan I sent to one of the players of a questchar telling him what he essentially had to do during the quest finale. Most of the time though, everything was only planned with an outline, so players could completely change the course of the quest.
But anyway, here it is:
Link.
It also contains some previously omitted pages, which I left out at the time because some players complained early on in the quest and I thought it might seem passive aggressive to make a joke of it when it was still recent. It's been a couple of years now, however, so whatever. It was all in good humour at the time, anyway.