The problem with verbal agreements

Here's a short conversation bewteen a vendor of yew trees, and a customer, and eventually (and pointlessly) a passer-by.


a Hello!
b Why did you say hello?
a Because I wanted to talk to you
b What did I want to say?
a I didn't know you wanted to say anything.
b How did you know I wanted to talk to you?
a I thought you wanted a yew.
b Why did you want a yew?
a I didn't, I found a yew
b Who for?
a You.
b Which you?
a This yew here.
b Ah very nice, is that for me?
a Take it, it's for you.
b But I like this yew, do I have to give it to you?
a It's not for me, I want you to have the yew.
b Why do I have to give it to him?
a Give it to who?
b I've got to give it to who?
a You.
b Where can I find you?
a Oh, I'll be here next week, with a yew.
b I'll meet him then will I?.
a Meet who?
b Oh, who will be there as well?
a I'll be the only one there.
b So how can I find you?
a I know where to find the yews.
b Where?
a Can't tell you.
b Ok, I promise I wont.
a Wont what?
b Tell you.
a Not if I don't tell you.
c Hello.
b Can I tell him?
a No one's going to tell you or him.
b Ok, so the secret's between us then.
c What secret?
b Where the yews are.
a There's a yew here.
b I know, but that yew's for you.
a I was trying to give it to you.
c Can I have the yew?

The point of the matter is that b (the customer) knows of people called I, You, Me, Who, etc - and despite the fact that he would like the tree, he doesn't get it.

I find it quite funny, but in another context, deadly serious.

Any thoughts?