A man goes into see his doctor and says,
“Every time I see a lorry, I get a hard-on.”
The doctor laughs. “I don’t believe you. Show me.”
So the man walks over to the window and after a lorry passes by, he pulls his trousers down to reveal a huge erection.
The doctor says, “I still don’t believe it. Do it again.”
So the man goes over to the window, another lorry goes by and sure enough he gets another erection.
“This isn’t possible,” says the doctor, scratching his head.
“Give me a blood sample and come back in a couple of weeks time.
Two weeks later the man returns to the doctor. “Sit down, I have some bad news for you…
I’m afraid that you are HGV positive.
