The kid next door thinks I ripped him off when I only charged $40 to install air conditioning in his car!!!!!!?

Everyone wants somethin' for nothin'. Pacify the little beeyotch by offering to replace his brakes for free. It's a simple procedure that involves sawing a hole into the floorboard in front of the driver's seat. If he *once again* pisses and moans about your unconventional but thoroughly innovative repair job, tell him that if that method of braking is good enough for Fred Flintstone, then it's good enough for his bitchass.