Star Control: The Small War of 2015 takes place, a war where many of humanity's nuclear weapons were used, and resolved in the isolations of the weapons. It is called the "small war" because it could have been much worse.
3rd Rock from the Sun: According to Dick Solomon in the episode "Angry Dick", a giant meteor is destined to collide with Earth. When he says this in his physics class and all of his students turn towards him in shock, he adds, "which obviously doesn't exist because I'm kidding!"
.hack: A fire occurs at the main CC Corp building, resulting in a large loss of data forcing The World to shut down. By splicing in data from what would have been another game, CC Corp is able to rebuild the game system, thus creating The World:R2.