A guy goes to visit his doctor. Here is the conversation that ensued.
"Don't laugh!" said 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," the patient said, and proceeded to drop his trousers, revealing the tiniest 'whoo-ha' the doctor had ever seen. It couldn't have been bigger than the size of an AAA battery..The doctor fell laughing to the floor.. Ten minutes later he was able to struggle to his feet and regain his composure.
"I'm so sorry," said the doctor. "I really am. 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," the patient replied.
The doctor fainted!