Last night I was watching an old episode of Charmed in which a ghost seeks out the sisters for help. Nobody can see him but the sisters, and to the sisters he looks normal--until a bicycle runs through him, or he walks through a door. In typical fashion, this ghost tries to do normal things--turn on the TV for instance--but can't because he's a ghost. Yet he never sinks through the floor, he can sit and ride in a car, and climbs down stairs. Why is it that TV ghosts always have feet and asses that can interact with floors and chairs, but when that same ghost wants to kick a can or walk through a wall there's no resistance? Would it be so hard for these programs, who are already paying the special-effects guys to make coffee mugs thrown at the ghost to go right through him, to give us some good, old-fashioned floaty-ghost action?