A group of Polish tourists is flying on a small airplane through
the Grand Canyon on a sightseeing tour. The tour guide anounces:
"On the right of the airplane, you can see the famous Bright Angle
Falls." The tourists leap out of their seats and crowd to the
windows on the right side. This causes a dynamic imbalance, and the
plane violently rolls to the side and crashes into the canyon wall.
All aboard are lost. The moral to this episode is: always keep your
poles off the right side of the plane.