this guy goes to a psychiatrist and says,

- “Doc, uh, my brother’s crazy; he thinks he’s a chicken.”

And, uh, the doctor says, “Well, why don’t you turn him in?”

The guy says, “I would, but I need the eggs.”

http://www.goodreads.com/quotes/208547-it-reminds-me-of-that-old-joke–you-know-a?auto_login_attempted=true