Command blocks would be pretty interesting... If done right, traps could be made with them. Such as spawning animals. If you activate a certain redstone contraption, it spawns creepers. If you do the right contraption, it opens a door. Just some thoughts.
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Wait, all of this stuff is going to happen once? Well, I'd make sure to convert my time to GMT before doing something like this... I doubt that I can make it, but I'll check some world-clock-thing first. Edit: Appears the time is 11:00 PM for GMT, wich is 12:00 PM/ 00:00 AM for me. Since that's midnight, don't count on many (or any) europeans coming.