There is usually no mistaking the act or intent of extending a middle finger.
Take John Swartz, for example. In May 2006, Mr. Swartz was a passenger in a car in a rural part of upstate New York when he spotted a police car that was using a radar speed-tracking device.
Mr. Swartz, a Vietnam veteran and retired airline pilot, acted on instinct to show his displeasure: he extended his right arm outside the passenger’s side window, and then further extended his middle finger over the car’s roof.
The reaction was swift. The officer followed the car; words were exchanged; backups were called; and Mr. Swartz was arrested on a charge of disorderly conduct.
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