The New York Post profiles a West Village man who's taken to vandalizing cars with incessant anti-theft alarms. Harry Schroder is a retired art director who likes to spend his afternoons practicing the piano in his home on Charlton St. Occasionally, however, he is interrupted by a car alarm. If it goes on long enough, Schroder leaves the car's owner a note in black magic market on an 18-inch by 24-inch posterboard which he sticks......