I knew someone who had an alarm go off on the street in front of his house about 6 times every night. It would time out, but SOMEthing was setting it off. The owner of the car lived 10 houses down, but always parked it directly occross the street from this guy's house. One morning when the car's owner came back, it seemed that someone opened the hood of his car with a crowbar and disconnected the battery. The car disappeared after that.