[Ringo's arm is trapped inside a mailbox]
John: What are you doing?
Ringo: Posting a letter.
John: What are you doing?
Ringo: Posting a letter.
[Ringo's arm is trapped inside a mailbox]
John : What are you doing?
Ringo : Posting a letter.
http://www.moviequotedb.com/movies/help/quote_41184.html