This is a beautiful use of technology.
The cop cited him for going over 40 mph in a 25 zone, which he was too frazzled to contest at the time. After he had cooled down and parked his car later, he remembered that he had been running the My Tracks app by Google which records your GPS info and speed. Pulling up the data, he found that he hadn't been speeding. When his court date arrived, he plead not guilty, presented his GPS data, and successfully got out of the ticket.