Good joke

Edwin's friend James was over the other day and I overheard them telling jokes to each other. It went like this...

J- Knock, knock.

E- Whose there?

J- Banana.

E- Banana who?

J- Why did the dinosaur cross the road?

{pause} puzzled giggle from Edwin

E- That's a good one!

- I interject with "why?"

J- To get milk from the movie theatre.

I laughed.