If I sent flowers with the motto “Avis in infernum vetus mater miseri irrumator”. It translates to “Roast in hell you miserable old mother fucker”. To my fathers funeral? I doubt many would be able to translate the Latin into English.
The better angel says not to do it. But the evil angel is saying do it, in fact bribe whoever is doing the gravestone to engrave it there. Not many people would get the Latin bit. Some archaeologist in the future might chuckle at it.
I won’t do it, but fantasizing about it has it’s humorous element.