What happens when you call a restaurant to place an order, put them on hold for a second while you call another restaurant and then ask the first one to repeat the order? Total chaos!!! Absofckin funny!
http://www.youtube.com/watch?v=7TXjtbl2y3U

The second one needs no intro.. this is the funniest prank call ever!
http://www.youtube.com/watch?v=J5z4Vs26-TI