Originally posted by Tsen
Even provided that dreams are symbollic things, I don't put stock in such superstitions, and I'd feel perfectly safe breaking a mirror. Hell, I'd play basketball in a room full of 'em just to see them fragment.

And I think there was a purpose to breaking a mirror--- In dreams, your mind doesn't always move fast enough to comprehend things such as the internal workings of clocks or light switches, so breaking a mirror and observing the shattered pieces would be interesting just for the sake of seeing what was reflected in the fragments.
You don't have to be superstitious to believe in Synchronicity. Mirrors simply pop up too often as Dream Symbols -- symbolizing our Self Image -- that to destroy a mirror in a dream would simply be to invite a Synchronistic disaster.

Indeed, I would hesitate to destroy anything in a dream. dreams are real in a subjective way, and they impact upon our characters and personalities. Turning one's dream self into a habitual destroyer may set up a pattern of behavior that would not necessarily stop when the alarm clock goes off in the morning.