Late in the game, a story mission depicts some memorable events at a wedding. Once that mission has been completed, you can re-visit the church. Enter it again by scaling the construction objects. Inside, descend the stairs and proceed to the double doors. As you pass the last flight of stairs, you'll hear the sound of dishes breaking. Head quickly back outside and you'll find that the streets are bare, except for police cruisers that patrol randomly or appear once you commit a crime.