Diggnation host Alex Albrecht hired some iPhone application developers to work on various projects. His most recent application that was added to the iTunes App Store is called Duel [iTunes link]. He released the game through a company called App Dragon.
To play Duel with a friend, both of you need iPhones and need to connect to each other through Bluetooth. After that, there is a countdown and you have to point your iPhone at your friend horizontally similar to how people in the Wild Wild West did it. Alex Albrecht was a co-host of former TechTV show The Screen Savers.