Q: Why is there a fence around the cemetery?
A: Because people are dying to get in!
Explanation: A cemetery is a graveyard, a place where dead people are buried. If you are looking for some famous cemeteries, you might check out this link from Fordor’s. Most cemeteries that I know of have a fence going around the outside of the cemetery. I am not sure why, exactly, but perhaps the fence shows where the boundaries of the graveyard are.
“Dying to do something” is an idiom that means that you really want to do something. If I say that I am dying to eat churros in Madrid, it means that I really want to try them when I travel to Madrid.
This joke is funny because it plays with the meaning of “dying to:” the literal meaning that people are actually losing their lives (we all will die!) and will go to the graveyard, and the figurative meaning that people are dying to get into the cemetery (they really want to get in). Most people do not want to get into a cemetery; most people do not want to die.
Suicide, though, is not funny. If you are considering suicide, please, please, please reach out to those who are near you and ask for help. There are people who love you, even in the darkest moments. For right now, read this amazing, saving poem.
If you are looking for an odd and wonderful book to read, I would highly recommend The Graveyard Book by Neil Gaiman. It takes a while to get into the book, but it is worth the effort. Here is chapter 1: