Humor that you don't get

Two monkeys are taking a bath together.
One says, “Please pass the soap.”
The other replies, “What, me? I’m not a typewriter!”

Can someone please explain this to me? I heard it in a meeting today and didn’t get it.

It’s only funny the second time you hear it.

I think it’s an example of this:

It’s usually a joke that everyone’s in on, except perhaps you or someone else; to feign laughter, as if the punchline was brilliant, but it’s totally meaningless. It’s usually done as a form of mockery, to see if you’ll laugh just because everyone else is.

What did one ant say to the other in the bathtub?

“Pass the ketchup, my back itches.”

Those are the jokes that are funny only at 2 AM at a teen girl slumber party, or when completely drunk.
~VOW