Hi readers! Scavenger hunt time. Can you send us a photo of a Muni driver on a cell phone? We'll be your best friend if you do. Y'see, a friend of SFist is working on a super-cool Muni-related video project and asked us for some help; and so we're dutifully passing the buck along to you. If you already have a photo of drivers with phones: great! And if you don't: could you keep......