During a hectic night of mail processing at the post office, a number of letters fell off an elevated conveyor belt and scattered onto the floor. Before the area supervisor had a chance to pick them up, the facility manager, who had a reputation for being stern, came upon the scene.

"Why is this mail on the floor?" he demanded angrily.

Without hesitation the supervisor replied, "Gravity, sir."

Received from Thomas Ellsworth.

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