Episode - 2F11\\
First Aired - 2/5/1995

After unleashing an unflattering balloon caricature of Principal Skinner, Bart is forced to help Skinner with his early-morning astronomy...and Bart [[AchievementsInIgnorance fooling around with the telescope]] leads to the discovery of a comet that's on a collision course with Springfield.
!!This episode contains examples of ([[YMMV/TheSimpsonsS6E14BartsComet YMMV]]):
* AchievementsInIgnorance: Skinner has been at his astronomy for years, makes very calculated and precise adjustments with his telescope with the hope of finding something interesting, and has ultimately turned up nothing. Bart screws around with the telescope for a few seconds, spins it around haphazardly, and discovers a comet.
* BaitAndSwitch: Ned finds all of Springfield right outside his bomb shelter, glaring at him and in some cases carrying weapons. Moe angrily states they want in the shelter themselves, but Ned tells them there's no space. So Moe just calmly announces they'll all "go off and die, then", and everyone turns to leave.
* BigNo: Skinner unleashes four of them over the course of the episode.
* BrickJoke: A running one involving the "Big Butt Skinner" balloon.
* TheCuckoolanderWasRight: Early on, Homer shrugs off the comet's perceived threat, claiming that it will burn up in the atmosphere and end up "no bigger than a Chihuahua's head." That's exactly what happens, complete with a nearby Chihuahua for comparison.
-->'''Bart:''' And the weirdest thing of all is that dad was right all along.
-->'''Homer:''' I know kids, I'm scared too! (''The family hugs together, terrified'')
* DemocracyIsBad: Congress is about to pass a bill on the evacuation of Springfield from the comet, but then the bill has pornography rider attached to it, and is promptly struck down. This leads Kent Brockman to declare: "I've said it before, and I'll say it again: Democracy simply doesn't work."
* {{Homage}}: The final act has several to ''Series/TheTwilightZone'' episode "The Monsters Are Due on Maple Street".
* {{Hypocrite}}: Homer condemns everyone (including the Flanders family) for Ned having to leave the shelter when it was Homer's own idea in the first place.
* {{Irony}}: Out of all people in the shelter, the one to leave was Ned Flanders, who built it in the first place.
** The only thing the comet destroyed was the bomb-shelter that was supposed to protect everybody (it also pops the balloon).
* JerkWithAHeartOfGold: Hypocrisy or not, Homer is the first one to leave the shelter to look for Ned. Moe shortly follows.
** JerkassHasAPoint: And he knew the sound Moe was making was a Baby Ox. Which prompts Moe to be the first after Homer to follow him.
* NoodleIncident: Skinner got even with Principal Kohoutek... "him and that little boy of his."
** Homer's story of how he drove away from some unnamed crime and missed work.
* RuleOfThree: Skinner's BigNo when he finds out Bart discovered a comet, that he just let go of the balloon and read the front page article about how the Prez says school is for losers.
* ScrewThisImOuttaHere: After Skinner's attempts to down the balloon fail, Bart attempts to flee the scene, to no avail. ("Race you to Utah, Milhouse.")