Replying to Revenge ideas

so, this kid Torrey threw a milkshake at my car because I called him "fatty in the corner." only, to me, fatty is a tearm of endearment. and also, he was rapidly consuming his snack of 2 double-double cheeseburgers, 4 fries, 2 sodas and 2 milkshakes from in-n-out when i called him that.
but apparently, he is really touchy about being his weight and felt inclined to chuck a milkshake at my back windshield.
i need some good, old fashioned, really mature revenge. for example, Exxlax brownies or Roofies-in-his-beer or soemthing. any ideas/ recepies?
thanks!

'When I was 3 or 4 or 5, I got kicked out of school in Denmark when they relized I didn't speak Danish. Then the sadists I lived with put me to work on a pig farm. Later, I was to get bit by a monkey in Bali and lost in Thailand.'