Crazy, Not Stupid 神经，可是不笨

One truck driver was doing his usual delivery to a mental hospital.

He discovered a flat tyre when he was about to leave the premises. He jacked up the truck and took the flat tyre down.

When he was about to fix the spare tyre, he accidentally dropped all the bolts into the drain.

As he can't fish the bolts out, he started to panic. 

One patient happened to walk by and he asked the driver what happened.Since there's nothing much he can do, the driver told the patient the whole incident.

The patient laughed at him and said: "You can't even fix such a simple problem? No wonder you are destined to be a truck driver." 

"Here's what you can do: take one bolt each from the other 3 tyres, and fix it onto this tyre. Then drive to the nearest workshop and replace the missing ones. It is as easy as that."

The driver was very impressed and asked: "You're so smart! Then why are you here at the mental hospital?"

The patient replied: "Hello, I stay here because I'm crazy, not stupid. OK?!"