Maxperson
Morkus from Orkus
I used to do it so that I could have a good idea of what would happen if the players picked A, B or C, but then I realized that what happens next is usually pretty obvious, and that often the players picked D, E or F and I had to figure it out on the spot anyway.My old 1e DMs used to do this. They'd generate a tough situation with no solution in mind, just to see how we'd handle it. It was a lot of fun, even if we didn't always find a way through.
Coming up with would could happen was a waste of my time, so I stopped.