A Transplant.

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Two guys are drinking together at a bar and go into the bathroom. Standing at the urinal, Bill notices that his buddy Paul is very well endowed.

"Wasn't always that way,"Paul the buddy says. "It's a transplant. I had it done over on Harley Street. It cost a thousand pounds, but as you can see, it's well worth every bit."

So Bill visits the doctor on Harley Street that day. Six months later, the two guys meet up again at the bar. Bill explains, "I took your advice, but you were robbed. I got mine for £500, not a thousand."

They go back to the restroom to compare. "No wonder," his buddy Paul says, "That's my old one!".