Reminds me of the late 70's when I had my 77 Dodge street van. I installed a electric compressor and tank and an air horn off of an 18 wheeler. Back then Florida still had safety inspections.
I went to the inspection station for my annual and when the inspector said "hit your horn" I pulled on the air horn chain. The inspector just about jumped out of his skin, it scared him so much he tossed his clipboard into the air. He then threatened to fail me saying the horn was illegal (he was pissed). I asked him to show it to me in writing, he couldn't so he passed me, although he sure didn't want too. - Dan