When his son refused to get a job, his father insisted he join the Marine Corps. At the physical, the doctor directed the reluctant recruit to read the eye chart across the room.

—What chart, doc?—, the young man asked.

—The one on the wall!—, the doctor said.
—What wall?—, said the young man.

Sensing he had a deadbeat on his hands, and wanting to fill the quota, the doctor asked his nurse to strip down and walk into the exam room. 

—Now what do you see, son?

—Doc, I can’t see a thing, I’m as blind as a bat.

The doctor said,
—Well, you may not see anything, but your dick is pointing straight towards Paris Island, South Carolina. Welcome to the U.S. Marine Corps!

Courtesy of Bob Meehan