"It's Hereditary" joke
Two brothers enlisting in the Army were undergoing their physicals. During their physicals, the doctor was shocked to discover that both of them possessed incredibly long, oversized penises.
"How do you account for this?" asked the doctor.
"It's hereditary, sir," the younger one replied.
"I see," replied the doctor. "So your father is the reason for your elongated penises?"
"No sir, our mother," the young man said.
"Your mother?" the doctor exclaimed. "You idiot, women don't have penises!"
"I realize that, sir," the recruit replied. "but, our mother only had one arm. When it came time to get us out of the bathtub, she had to manage as best she could."
Not enough votes...