On the last day of every month, close the blinds or curtains before you sleep. If you hear a tapping noise at your window in the middle of the night, don't open your eyes.

If you're one of the unlucky ones, you'll hear that pebble sound at your window. It's not a friend; just keep your eyes shut. The sound will get louder, the tapping will get faster and faster. Don't let your curiosity get the better of you, don't move. It'll lose its patience, it'll start thumping on the window. Your window will shake and shudder, the noises will only get louder. It will furiously pound on the window, shaking the panes; don't worry, the window won't break, but for goodness' sake, DON'T OPEN YOUR EYES. No matter how scared you are, no matter how badly you want to scream, pretend like you don't hear it, pretend you're still asleep.

After a while, the noises will stop. Don't fall for it, keep your eyes shut. Try to sleep, if you can. Don't get up, don't open your eyes until the sun comes up, only light can stop them –bright lights.

Those who do open their eyes... well, no one really knows what happens.