That sounds like fun. If you secure it tightly, it won't fall. Las Vegas has mirrors on the ceiling, but if there's an earthquake or something, and it falls...your face could get mutilated by glass. That sounds scary.
Architectually if you were to reinforce your ceiling with the right mounting technology that can flow a current of Electricity and Cable to your Television and have it mounted above your head then I believe it is possible; but I would not recommend it on the count of natural disasters that could make it unstable and neck injuries from it's altitude in position ;)
It might be possible to do without it falling on you but there are other reasons not to do that. From ehow: "Large LCD TVs are designed so their weight is balanced when the set is upright, as it is when mounted to a wall. When a large LCD set is laid flat, there is very little support for the middle part of the screen. It is possible that the screen could become cracked or distorted around the edges if it lays static for a prolonged period of time." Although there seemed to be some debate about it I have also heard that plasma tv's should not lie flat, especially if its long term.