You and your accomplice head to wall-mart to get some beers. The accomplice goes inside alone and purchases a case of Dos at the electronics register. He then walks out and hands you the receipt in the car. Now the driver walks in and grabs the EXACT same thing. The driver needs to exit through the door opposite of his accomplice. If the driver is asked for his receipt he simply just pulls it out. Do not over think this; remember-> you already bought the beer.
Take note: This must be a timely process. Keep it under 10 minutes.
Me and Nick just did The Philly fake-out. Now we have twice as much beer at no extra cost!