This phrase's origins date to games of Trivial Pursuit; when a player lands on a question for a piece of pie, they would typically announce it to the other players. "I'll take Sports and Leisure...for pie." This would automatically ensure that they would have to answer the most difficult question to continue, something that scientists have empirically linked to having announced "for pie."
Male Passenger: Ooooh...for pie.
Police Siren: *siren*