two days ago, my horn began honking for no reason...as if the anti theft alarm was going off. I was able to shut it off only by putting the key in its ignition. Last night, the possession by the devil was complete and at 10:30pm, my car began to honk (same as before) incessantly... and I wasn't able to turn it off. This happened about 5 time within 30 minutes. I tried to disconnect the battery but of course, the Prius designers placed the battery in a location that makes it impossible to disconnect. Anyone know why this horn malfunction is occurring?