The Store: A Supernatural Short Story

A story based on this prompt from Facebook:

After a long night of tossing and turning in your bed, you realize sleep is not in the cards today. You dress and make your way to the 24 hour store to do some 3 am shopping. Walking the aisles, inspecting products you otherwise wouldn't notice the power flickers twice then goes out completely. A few aisles over you hear what sounds to be a few cans fall from a shelf. Taking a deep breath you begin again down the aisle and the lights flicker back to life. You look around and find the store a disaster. What happens next?

You already read this much; you might as well read the story too! Even if you don't like it, at least you won't be wasting too much time!