I think that I'm a chicken

Psychiatrist: What's your problem?

Patient: I think I'm a chicken.

Psychiatrist: How long has this been going on?

Patient: Ever since I was an egg!

精神病医师：你哪里不舒服？

病人：我认为我是一只鸡。

精神病医师：这种情况从什么时候开始的？

病人：从我还是一只蛋的时候开始。