Funny story, (sorry I can’t remember the celebrity's name) there was a new-country singer that had RR horns (like that set above) mounted under the hood of his HD 250 pickup truck. If he flipped a dash board switch, then the RR horns blasted out when he honked his regular truck horn.
He had a minor road rage incident and was going to blast a jerk while on the way home from a concert. He didn’t, but he forgot to turn off the switch. He got home and parked in the garage. He used his key fob to lock the truck. That trigger a beep of the truck horn - and then came the blast of the monster horns at 2AM.