Why do people nail their windows shut when the house is haunted?

Well, honey, people nail their Windows shut in haunted houses because they don't want any unwanted ghostly visitors popping in unannounced. It's like putting up a "do not disturb" sign for the afterlife. Plus, it's a good way to keep those pesky spirits from floating in and rearranging your furniture while you're trying to catch some shut-eye.