Simply putting knives into the silverware drawer would routinely set off my internal alarm until the sensitivity was turned down.......one knife dropped too abruptly would do it!
Now, my coach horn never went off unexpectedly, so no clue.
I did have my air horns sound off once in the middle of the night on my Dynasty when my 2 cats decided to sit on the steering wheel for some reason at 3 in the morning .....and these were two pairs of the big Hadley two-tone horns. Did a lot of apologizing to neighbors in the RV Park the next couple of days. It was a short blast as it scared the cats to death and they headed for cover
Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5FI