This guy is offering a unique prank opportunity. He’s going to Poland during Christmas break, and will send three postcards from there to a person you choose. He’ll include personal details about the addressee, which you’ll provide, which will leave them scratching their heads about who they know in Eastern Europe who has such intimate knowledge of their lives. To make it even better, one of the postcards will be a 1995 promotional piece for Mariel Hemingway’s short-lived CBS series “Central Park West,” and another will be from the 1996 Summer Olympics in Atlanta.