The reflection of a haunted mirror is often an actual parallel dimension, and given half a chance an inhabitant of that dimension will attempt to possess and replace you at the first opportunity. This of course would leave you trapped in the mirror dimension, but so what? Who couldn't use a rest from the problems and responsibilities of their normal, daily routine? Just make sure that the reflection contains a nice, comfy bed, a tv and your bong. Now you're all set for the ultimate staycation!