The doctor replied, "Of course I won't laugh, I am professional. In over twenty years I've never laughed at the patient."
"Okay then, Bob said, and proceded to drop his trousers, reveiling the tiniest "whoo-ha" the doctor had ever seen. It couldn't have been begger than the size of AAA battery.
Unable to control himself, the doctor started gigling, then fell laughing to the floor. The minutes later he was able to struggle to his feet and again his composure.
"I'm so sorry", said the doctor. "I really am. I don't know what came over me. On my honor as a doctor and a gentleman, I promise it won't happen again. Now what seems to be a problem?"
"It's swollen," Bob replied.