Washed the 420 this afternoon then took it out for about 5 miles. As I was turning into the drive the headlights, already on, started flashing and some sort of horn-like device started sounding repeatedly. This lasted maybe 5 seconds, then it stopped. I drove up to the garage door and stopped; engine was running normally, etc.
Was this some sort of alarm system? I've owned Her 6 years and never had this happen before.