One of the most disturbing developments in my life recently has been a recurring "Terminator" dream. In this dream, Terminators are constantly being sent back in time to kill me. The problem with terminators from the future is that no matter how many of them you destroy (and of course, destroying them is really, really hard), there are always more being sent from the future, as machines in the future have the benefit of 20/20 hindsight.
This of course leads to a dream that can potentially run on until I wake up, and is very disturbing. Damn you Terminators.