Ghosts and Gravity
Ghosts tend to be able to float about and walk through walls, although I have noticed they tend to use lifts when going up and down. The thing here is if you have nothing to hold you down you would immediately disappear into the void, this for those who like to believe in ghosts is an unwanted truth. Amongst other things the earth spins at 1,000mph and circles the sun at 60,000mph. If you are not corporeal and gravity doesn’t affect you, you have a real problem.
‘Everyone’s Story’, a part of ‘Many Shades of Evil’, throws a little more light on the ghost phenomenon.