A driver pulls up to the fence of an insane asylum for a short stop. About an hour later, when he returns to the car, he discovers that someone has stolen the 4 bolts from a wheel. In a state of bewilderment, he begins to think about how to solve the problem.
At that moment, from behind the fence, he hears a voice:
- Listen, you can take one bolt from each of the 3 remaining wheels and put them on the wheel where the original 4 bolts were missing. Thus, each wheel will have 3 screws, and with this solution, you can definitely go to the nearest mechanic...
The driver thanks him for the advice and wonders:
- I wouldn't have thought of that... But tell me, how come you're in an insane asylum?
To which the voice:
- I'm crazy, but I'm not stupid.