Joke?

Last Thursday, when I told an American guy in my client office my failure story about mistakenly hearing someone say "pawn shop" as "porn shop", he told me this.
A: My wife finally is gone to live in a Caribbean island.
B: Jamaica?
A: No, she went of her own accord.
If you understand what the point of this joke is, your English level is superb.
This is another one which was in the form of a riddle.
"What is it that is black and white and red all over?"
Can you answer this question?
These are jokes only meant to be spoken. So it may be difficult if it is written. This is a hint. I had heard the second one sometime somewhere, but I had no idea about the first one until he almost gave me the answer.