More Ideas

 The Plant

An Alien boy is given a plant in a pot for his birthday. He leaves it on a windowsill in the sun and it dries out! In the middle of the flower is planet Earth and it is slowly withering away. His alien mother tells him to water it, he does and a tsunami washes over Earth.

The Jurassic Chest

An alien boy has grown up and has put all of his toy dinosaurs in a chest. Years later, he returns to his bedroom and finds the chest containing the dinosaurs. Suddenly, people are being chased down the street by dinosaurs. (The dinosaurs don't have to look real. They can be comical). 

Magnetic Personality 

A lonely boy finds a magnet in a box. Suddenly, he has a magnetic personality and everyone likes him. 

Earth Has Two Moons

Our moon has been visited by astronauts. No life was found and they planted a flag in it. The other does have a man on the moon on it and it is made of cheese. Only one small boy can see it. 

All Of The Colours 

One day, an alien boy uses the last colour when colouring in a colouring book. From then on, the world becomes black and white until he buys some new alien pens.