[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