Humpty Dumpty Sat on a Wall.

I know he did, I have been told about it over and over again. Why? I just don't know, but I am sure he was shaped like an egg. We know eggs don't fall down and break into a thousand little pieces, but that's what happened to Humpty! Was Humpty just an empty shell?

Who writes these things anyway? 

Here's a wall.  Oh, never mind It's a ceiling. But nobody is sitting on it, are they? Or is it "is they?"

Now here's a real wall.  Two of them! And a person, who is neither sitting on one  nor falling off! Now, that's my kind of wall.