This is an old one and not sure where I heard it first, so if on here apologies to the original storyteller ...
A young boy was feeling very sad as Christmas approached because there was something he really wanted in a shop window and he couldn't hope to raise the £20 that it cost. So he decided to write a letter to Santa.
He wrote the letter asking for £20 and posted it addressed to Santa Claus at the North Pole.
When they read the letter, a group of people at the Post Office were touched by the little boy's plight and decided to have a whip round for him. They managed to raise £18 and although it wasn't quite what he had asked for, they sent it to him happy in the thought that they had done something good at Christmas.
When Christmas arrived, the little boy was delighted to receive the £18 and was able to scrape together the other £2 to get the present he wanted. He decided to write back to Santa to thank him.
Just after Christmas he put the thank you letter in the same post box pleased that Santa would receive his thanks.
It went something like this ...
'Thank you Santa for sending me the money I asked for, it made me very happy.
I asked you for £20 but only got £18.
Those thieving bastards at the Post Office must have pinched the other £2!'