who is nuts? http://www.51education.net来自无忧英语教育幽默笑话频道

In a hospital for mentally disturbed people, when
the doctor walked into the room of a patient, he
saw him dangling from the ceiling. Being frightened,
he called the nurse to come and pull him down for
fear that the man might fall to his death. The nurse
said: "Doctor, every day this patient thinks that he
is a lamp, therefore, he often hangs from the ceiling!"
The doctor said: "No, you have to pull him
down at once; otherwise, he'll die if he falls down."
After a pause, the nurse answered:
"But the light will go out after I pull him down!

一家智障的病院里，医师走进一个病人的房间，
发现病人正吊在天花板上晃来晃去，医师怕病人
会摔死，叫护士赶紧把病人拉下来。护士说：
「医生，这个病人每天都认为自己是一盏灯，
所以常常把自己吊在天花板上。」
医师说：「不行，你还是得马上把他拉下来，
免得他摔死。」护士停顿了一下，
说：「可是，如果我把他拉下来，灯不就熄了吗？