The Bakers Dozen

Once upon a time, a baker and his family were haunted by an invisible imp.
Often, the strange creature would run amok in their shop, gobbling up cakes and pies and bread and making a terrible mess and sometimes it would even be very naughty and throw pies in the faces of the baker and his customers or chase the bakers wife around their shop with a long stick of french bread.
And it got so bad that, after only a short time, customers refused to go to their bakery and the baker and his wife thought they would go out of business.
But then, one night, the baker had an idea and the next day, he handed his wife and daughter a rolling pin each and then picked up a big jar from his shelf.
"I'm going to catch that imp once and for all", he said.
"But how?", asked his wife, "If you can't see it".
"You'll see", said the baker.
And then, entering his shop, he saw, in a corner, chairs and tables being knocked over and heard the sound of the invisible imps mischievous laughter.
"Hee! Hee! Hee!", he heard it say.
But then, the imp must have seem him for he heard it roar and felt it leap upon him.
Now, the baker felt so frightened that he wanted to turn and run but he didn't.
Instead, the baker took the lid off of the jar he was holding and tipped it up over the imps head.
And the moment he did, bakers flour poured out of the jar all over the imp and, covered in white flour, it was no longer invisible.
"Bleurggh!", said the imp spitting flour out of its mouth and trying to shake the flour off of itself.
"Quick!", shouted the baker to his wife and daughter, "Get it".
And then, into the shop with their rolling pins they came and seeing the creature, bashed it upon its one horned head.
So frightened was the imp that it scampered away to hide.
Unfortunately, because it was covered in flour, it left white, floury, three toed footprints all over the floor and the baker and his family just followed the footprints, chasing the imp until, in desperation, it dived into their baking oven.
"Ha!", said the baker, shutting the door of the oven behind it, "I've got you now".
Realizing where it was the imp pleaded with the baker not to light the oven saying that he had only come to the bakers shop because he was so hungry.
And the baker, taking pity upon the imp said that the imp could continue to live in his shop if it was well behaved and, in return, the baker said that, every day, he would make a current bun especially for him.
And, the imp agreeing to behave himself, from that day onwards, whenever the baker made current buns, instead of the usual twelve, he would always make thirteen; one extra just for the imp and thats how, over time, 13 became known as "a bakers dozen".