I thought of this one reading the comments about itchy scrotums in another thread. I was told this one while I was still a sweet, innocent little Boy Scout. Our troop was known for things like building bombs and such, though, so none of us were really innocent. The joke has probably been around, but this is the version of it I remember:

A soldier was transferred to a new base. Being a celebrated veteran, the men were looking forward to meeting him. The schedule of the base was different than he was used to, however.

"We get up a 5, and are on duty at 6!" The commander told him. "Now, I read here you were on active duty in the war? How was it?"

"Sir," the new man replied, "I got my balls shot off, sir! Other than that, it was all right."

"Oh, well, you can sleep in until 9 then, because all we do from 6 to 9 is stand around and scratch our balls anyway, son!" The commander told him.

Definitely an "oldie." I first heard it in the 1950s!

Before my Surgery, My Anesthetist offered to knock me out with gas or a boat paddle...

It was an Ether/Oar situation

A scribe in Huntly, NZ, public toilet. "some come here to shit and stink, some come here to sit and think. I come here to scratch my balls and read the writing on the walls!