https://goo.gl/0dOPROne day, all the planets got together and decreed that Pluto was too immature and silly to be considered a planet. He was thrown out of the Planet Club Society and sent to the Kuiper Belt with all the other silly asteroids.
Enraged, Pluto decided that if they're going to treat him like an asteroid, then maybe he should act like one.
If Pluto can't be a planet, then no one can!