Don't Laugh

Don't laugh!' said the patient, Ron.
'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,' Ron said, & proceeded to drop his trousers, revealing the
tiniest 'whooha' the doctor had ever seen. It couldn't have been
bigger than the size of a 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 & regain 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 & a gentleman, I promise it won't
happen again.
Now what seems to be the problem?'

'It's swollen,' Ron replied...