My wife and I finally boarded the plane in San Francisco last Sunday
heading home.

As the plane reached cruising speed with the seat belt sign switched
off, a 6 ft 3' black man with the build of Mike Tyson in the front row
got up from his seat, turned to face the back, raised his arm and
yelled, 'HIJACK!'

Everyone was frozen to the seat, expecting the worst to happen.

And two stewards were about to jump onto this guy to overpower him
when another voice answered from the back of the plane: 'HI JOHN!'

The moral of the story is: If you have a friend named Jack, for
heaven's sake don't ever call him in the plane. Otherwise you may land
yourself in deep s.hit.