Get a lot of people to stop mining.

The more hardware there is in the network looking for proof of work, the higher the difficulty when it adjusts.

So basically, it's mostly going to go up as new miners are coming in, and existing miners upgrade their hardware.

A virus that disables the fans on 58XX cards would probably work nicely.

WoW, that's pretty easy to pull off and is actually an viable idea.
And probably won't even be detected by most AntiVirus.

Starcraft ? We need to have a forums only Starcraft 2 tourney so I can own all of you guys. I am preatty sure we can play SC2 with fully maxed settings running the shit we're running lol.

If this ends up happneing Im going to blame you.

If you stop mining, that'll bring down difficulty just a hair.  So, stop. 

Just wait for late 2012 when the world ends the block reward is halved

hopes and dreams.

Nonsense, that is just equivalent to a 100% difficulty increase. We've had increases close to that. Except unlike a normal difficulty increase, this will actually reduce the supply of bitcoins, which should increase the price. I doubt anyone will be quitting then.