"Don't laugh!" said Ed the patient .

"Of course I won't laugh," the doctor said. "I'm a professional. In over
twenty years I've never laughed at a patient"

"Okay then," Ed said, and proceeded to drop his trousers, revealing the
tiniest willy the doctor had ever seen. It couldn't have been bigger
than the size of an AAA battery.

Unable to control himself, the doctor started giggling, then fell
laughing to the floor. Ten minutes later he was able to struggle to his
feet and regain his composure.

"I'm so, so sorry," said the doctor."I really am sorry, I don't know
what came over me. On my honour as a doctor and a gentleman, I promise
it won't happen again.

Now...what seems to be the problem?"

"It's swollen," Ed replied.