I have a buddy that is an electronics repairman and always has a very nice and very loud stereo in anything he drives, he also really likes novelty songs. Anytime someone pulls up next to him playing their rap too loud, he cranks up 'poisoning pigeons in the park,' 'I've got a Lovely Bunch of Coconuts,' 'The Lumberjack Song,' or something else equally appropriate to blast the offenders out of their car with.