Yeah, I know that may seem morbid, but if you think about it, who do you really trust to do it for you? What would they want all for generations to come to read on your headstone? What would you want?
This person wrote their own, presumably: "I told you I was sick!" (Headstone in GA cemetery)
I cannot be sure, but I think someone else wrote this particular one, but I couldn't think of anything more fitting: "That's all, folks!" (Mel Blanc)
Here is someone's idea of a joke, I think. "Stranger! Approach this spot with gravity! John Brown is filling his last cavity!" (unknown dentist).
One of my favorites is