Easy target. Grab the hand, engaging the thumb. Roll it over towards the thumb and back towards the forearm. Then push the whole thing down towards the ground. Tears will flow. Break it if you must but definitely add pressure to increase the pain. Use your free hand to grab the throat. To hell with the mashed potatoes on your suit. The look of surprise and pain is worth the cleaning bill.
Then simply have someone call the local constabulary. You'll have plenty of witnesses.