It was a cold winter night in Springfield. A light wind was blowing and the sky was clear, not a single cloud in sight.

Professor Frink as standing on the roof of his lab building; next to him a monstrous appliance that looked like a mixture of a plasma canon and a giant TV screen.

"With this cannon we are able to change any past event!" The professor said to the small robot dog that sat beside him "But the best thing is that we will be able to see the outcome on this screen before we make the change!"

He walked around the cannon and started to push a few buttons which caused the area around him to shine in a faint green light.

"Can you imagine?" he turned to the dog again "Can you imagine what we could do with it? We could stop Adolf Hitler from starting war! Or we could stop grandma from selling her prized pastry recipe!"

Professor Frink got so lost in his thoughts that at first he didn't notice his dog starting to chew up a bunch of cables that poked out of his invention.

"No! No, no, no..." he shouted but it was too late.

All of sudden the cannon shot out a thick green beam that flew across the town before the whole apparatus exploded.

Professor Frink managed to duck himself and as the air around him started to clear up again he wiped his glasses clean and started picking up the remains of his loyal robot friend.