you.
I would say the more important question is: "How many worlds are there in a joke"? Deep thought, hmm?
Who s the worlds first skeleton detective. Sherlock Bones
yo mama is so stupid she starved to death in a grocery store
cool story bro needs more cucumbers
Do you like fishsticks? (hope they answer yes) Then you're a gay fish!
The Joke - novel - has 296 pages.
There are 159 worlds including the 4 dutch worlds
there are 16 worlds. 8 normal worlds and 8 special worlds
The Many Worlds of Andre Norton has 208 pages.
four worlds
If you haven't heard the joke, the answer would be, "no". The person would then proceed to tell the joke. If you've heard the joke, you would say, "yes." There is no one specific joke that begins with "Did you hear about…" There are many jokes that begin in that way.