I am just saying right now that being trapped in a coffin and only having a cellphone at my disposal does not sound like a lot of fun. However, should this idea appeal to you, Gamasutra has an interview with guys that are making a game called, Grave Call. Of course we all know the proper way to get out of a coffin buried six feet under. Thanks cagey. At this moment, I am pretty sure that if you put me inside a coffin, someone is taking a nap, hopefully not a dirtnap however. Even though it's completely dark inside the coffin, the player always have the phone as a light source. But the biggest aspect is probably that you are talking to someone who will try their hardest to help you get out and comfort you along the way. If that's not enough, you can always push the lid of and get out.