Ava's Joke

Ava has a knock knock joke that she loves to tell. We're not sure where it came from, but here's how it goes:

Ava: knock knock (sounds like na na)

Other Person: Who's there?

Ava: Do do (sounds like dough dough)

Other Person: Do do who?

Ava: A do do!!!

Then she laughs like "isn't that a riot?" and inevitably, anyone who she's telling the joke to laughs too.

Recently, though, the joke underwent a revision. It happened when we were in LA last weekend and she heard Sophie tell the banana/orange joke ("orange you glad I didn't say 'banana'?").  Here's how the joke goes now:

Ava: knock knock (sounds like na na)

Other Person: Who's there?

Ava: Do do (sounds like dough dough)

Other Person: Do do who?

Ava: Beeoooooo!! (an attempt at 'banana who?', I think)

Definitely not as funny as the origianl version.