I'd laugh if it was schizophrenic (not that I have anything against people with this condition), only because it would be a 2-faced mirror (pun not intended).
Off-topic: Once at school me and my friends were teasing one of our other friends (as he was annoying) that involved making a happy face on one side of A4 paper and an angry face on the other, and constantly showing him both of the faces (as it reflected his volatile nature). It was funny though because he got angry, and you don't wanna see him when he's angry! o_0