Anyone who's played WoW will appreciate the humour - spo which would win... the unstoppable force or the immovable object? And what did that guy mean when he said "chuck norris dies?"
With good timing you used to be able to stop the train in Well by building on top of it as an engineer - I'm pretty sure they patched it though.
The next expansion features a gigantic space-time rift opening and evil spewing out of it to destroy the world. Perhaps this is what opens it. On a slightly related note, my personal favourite is The Stoppable Force