ive seen this used in a haunted house near me, an entire hallway. I dont know how to make it look like a mirror, but check for black or dark brown spandex in the fabric store. Just stretch it between a frame or a doorway, and push against it. Just be careful that people dont punch the actor. (i've seen this done.) I think a dim light shining down directly over the cloth would look cool.
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My house is haunted, and I have a feeling I have something to do with it. 
(COMING SOON.)
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