A pirate walks into a doctor's surgery.

"Avast, sawbones," he growls, "I wants ye to look at the moles on me back. I think they might be of the cancerin' kind."

The doctor has a look at the pirate's back. "It's OK," he says, "they're benign."

"Arrr... look again," says the pirate, "I'm pretty sure there be ten."