Caught the end of Ghost last night on Sky Living. It struck me as odd as there is a whole section on how he can't interact with living objects through touch. He goes and gets guidance from the train ghost who teaches him how to touch objects (even though he's dead).
Now, it may be a flaw in the film makers thoughts but if he cannot touch living objects with this his hands, surely that same logic applies to his feet. Why can he walk on floorboards? Surely if you apply the logic of he cant touch objects and his hands go through them when he tries, surely his feet would do the same and he would actually keep falling through the core of the earth and out the other side?