One day an airplane from Warsaw Airlines was in flight en route back to its native Poland. Then, some turbulence was encountered. The plane began shaking and vibrating violently, and the pilot could not stabilize or control the plane. He then made an announcement over the PA system.
He said "Will all passengers who are not natives of Poland, but visiting Poland, please take a seat to the right of the aisle. All natives of Poland, will you please be seated on the left of the aisle."
Quickly the passengers complied with the pilot's instructions. The airplane then stopped shaking, stabilized and the pilot had it under control. The co-pilot was amazed and perplexed. He asked the pilot "How on earth did you do that? And what has the natives or visitors sitting on which side of the aisle to do with anything?"
The pilot replied "Stability requirements mandate that all Poles be located in the left half plane!"
Claude