Last one to post in this thread wins!

A man sees a sign outside a house, "Talking dog for sale £10." He rings the bell, the owner appears and tells him
the dog can be viewed in the back garden.
The man sees a very nice looking Labrador retriever sitting there, "do you really talk?" he asks the dog.
"Yes" the Labrador replies.
After recovering from the shock of hearing the dog talk, he says to him, well, tell me your story.
The Labrador says, when I was very young I realised I could talk, and decided to help the government, so they joined me to the SAS, in no time at all they had me jetting off all over the world tracking spies, sitting in with heads of government, and reporting back to our prime minister, I was one of their most valuable spies for eight years,but the jetting around really tired me out, so I decided to take an undercover job at Heathrow Airport, and do some specialist work. I uncovered some incredible dealings and was awarded several medals, but I've now decided to retire.
The man is amazed and goes back into the house and asks the man how much he wants for the dog. "Ten quid" he says.£10 , but this dog is amazing! why on earth are you selling him so cheaply?
"Because he's a lier, he's never been out of the back garden!"