This is very funny and very true: "...I am a little skeptical about spirits that never appear while people are strolling along the beach on a sunny day, without a cloud in the sky with a gentle breeze blowing. It is invariably an Edgar Allan Poe big old creaky dark house setting, at night with the rain pouring down and the wind howling, and the lights going out. That's when they see them? Sheesh!"
Why haven't I ever thought of that when people tell me they've seen ghosts? It seems so obvious now that you've said it!
Similarly, all kinds of supernatural spooky things seem to happen when the moon is full. Gee... ambiguous abnormal dim lighting... no, that couldn't have ANYTHING to do with it!