store, pretending to be a  strange customer looking for a particular book, the gag was  originally intended to be that Peter had previously made a prank  phone call to Ray asking for the book, and Ray realizing it was  Peter who made the call when he arrives at the store repeating the  act. The prank call was not used in the final edit of the film,  resulting in it seeming that Peter is just fooling around as he  enters the shop.