One truck driver was doing his usual delivery to the Mental Hospital. He discovered that the truck had a flat tyre, when he was about to go home. So, he jacked up the truck and took the flat tyre out. When he was about to fix the spare tyre, he accidentally dropped all the bolts into the deep drain close by. As he could not 'fish the bolts out', he started to panic.....One patient happened to walk past and asked the driver what happened. Since the driver had nothing else to do anyway; he told the patient the whole incident. The patient laughed at him & said "can't even fix such a simple Problem... No wonder you were  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 garage and get the missing bolts replaced, easy as that "Though annoyed, on hearing this simple explanation, the driver was very impressed and asked the patient "Since you're so smart, why the heck are you here at the Mental Hospital"? ...With a laugh, the patient replied: "Hello Mr, I stay here Because I'm CRAZY - not STUPID you idiot !