photographing lazers w/ mirrors and fog

Is there anyone out there that has photographed lazers bouncing off of mirrors, threw fog? I have only done that once and it didn't turn out that great. What I did was take 400 film, adjusted the shutter speed, focused and took the picture. Needless to say when the pictures were returned to me the lazer didn't look like a beam. It looked like a red flashlight. Does anyone know what I did wrong, and in any personal ways has anyone else done this before and been sucessful? Please explain.

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