So twice this has happened that im aware of. When i warm up my car or idle for too long my car will honk all by itself! The first time it did it i was at the bank and someone was apparently having trouble using the atm so i was waiting for a bit. All of a sudden i hear a honk which i was confused and startled by because there was noone around us, and i knew i didnt do it. (But the person did move out of the way). So does anyone elses car do this or do i just have a very impatient car? Lol