I've mentioned my father often enough. I get much of my sense of humor from him. I owe this icon to a prank he pulled back perhaps two decades ago.
In elder days, FatherSir was a master of bogus memos and other forms of office paperwork/humor miscegenation. He kept the best ones on file, and one day, he pulled out a few labels for me to examine.
At first glance, they looked like the labels that one finds on hazardous chemicals -- oxidizer, corrosive. FatherSir had made up a bogus memo detailing how certain hazardous personalities, as well as the hazardous chemicals, would now have to be properly labeled for workplace safety. This was a legacy bogus memo, so it had been very current and hilarious at the time.
I looked closer at the stickers. Corrosive Personality
. Flaming Asshole
I thought it was hilarious. Mama and swallowtayle
thought it was scandalous. I reproduced the Flaming Asshole warning sticker here, close enough.