This one doesn't just sit and shake. 

Joe Corrigan, Getty Images

A guy was driving around West Virginia when he saw a sign about a talking dog for sale. So he stopped and the owner told the man that the dog was in the back yard. The guy went into the back yard and saw a Labrador sitting there.

"You talk?"

"Yep," the dog answered.

"So what's your story?"

"Well I discovered that I could talk when I was pretty young, and I wanted to help the government, so I told the CIA about my gift and in no time they had me jetting from county to country, sitting with spies and world leaders because no one would have thought a dog would be eavesdropping. I was one of their most valuable spies for eight years," the dog said.

"But by jetting around I got really tired. It wore me out, so I decided to settle down. I signed up for a job at the airport to do some undercover security, wondering near suspicious characters and listening in. I uncovered some incredible dealings and was awarded a batch of medals, got married, had a mess of puppies, and now I'm just retired."

The guy was amazed. He went back in the house and asked the owner how much he wanted for the dog. "$10," the owner said.

"$10? For that dog? Why on earth are you selling him so cheap?"

"Because he's a liar, he never did any of those things."