Hey Arnold!

From TeeVeePedia, the Internet TV Encyclopedia.

Hey Arnold! was a Nickelodeon cartoon that lasted for exactly one episode. The premise of the show was that a gaggle of neighborhood kids kept shouting "Hey, Arnold!" at a boy named Arnold in an attempt to warn him that a comet was about to hit the exact spot where he was standing. The kid, convinced that the world was against him, didn't listen to his friends' pleas and was driven into the ground by the comet. (That's why it only lasted one episode.)

It can still be seen on Nickelodeon at Christmas or whenever there's a terrorist attack.