Psychiatrist: "What’s wrong with your brother?"
Sister: "He thinks that he’s a chicken,"
Psychiatrist: "I see. And how long has he been acting like a chicken?"
Sister: "Three years. We would have come in sooner, but we needed the eggs."
Psychiatrist: "What’s your problem?"
Patient: "I think that I’m a chicken."
Psychiatrist: "And how long has this been going on?"
Patient: "Ever since I was an egg."