Mental Patient Pilot

A plane was carrying mental patients who were making lot of noise, one patient pops into the cockpit and orders the pilots to teach him to fly a plane.

PILOT: yes we will but on a condition that u 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 manage to silence your friends?" 

PATIENT: I've opened the door for them to go and play out side.