... about the Irish rugger fan seriously injured in a car crash. He's quite mangled, and the surgeons have to castrate him.

So when he comes round, the Doc has to break the news: "Sorry Paddy, but you've lost your testicles" Of course, the guy faints from shock.

When he comes round again, the Doc says "I'm not surprised you fainted: not every day you get your testicles cut off, eh?"

To which Paddy says "Testicles! I thought ya said my Test Tickets!"