A plane was carrying psychiatric patients who were making a lot of noise; one patient pops into the cockpit and orders the pilots to teach him how to fly a plane.
PILOT: yes we will but on a condition that you tell your friends to keep quiet, off he goes and after a short while everywhere became quiet and he came back, "teach me now" he said, amazed, the pilots asked "but how did u managed to silence your friends?"
PATIENT: I've opened the door for them to go and play outside