Joe Nation wrote:
Knock knock
Who's there?
Don Ameche
Don Ameche who?
I'll be Don Ameche in a taxi honey, better be ready bout half past eight...
I remember this slightly differently... there was an entire episode of Mary Tyler Moore show, where they were trying to come up with a good knock-knock for Anna-Maria Albergheti.
Anna-Marie Albergheti in a taxi honey, better be ready 'bout half past eight... and fade to credits.