These are one of the funniest kind of jokes because the Medical profession is otherwise a serious profession.
A guy went into a public washroom and had to use the only available urinal, which was between two elderly men. He glanced to his left and saw the guy pizzing, but there were two streams.

"What the hell is that?" he asked.
"War wound. I took a bullet in my tool, in North Africa. They were able to save my tool but they had to leave two holes."

Then the guy looked to his right and saw three streams.
"What the hell is that?"
"War wound. Germany, bullet in the tool, left three holes."

The two veterans then looked over at the guy in the middle and saw 12 streams!
"War wound?" they both asked.
"Naah, my zipper's stuck."

:D :)