Shot with the Canon 550EX flash which has multiple flash capability. Let it flash 3 times during a 1/5 second exposure.
In Photoshop, darkened the background, increased contrast, blurred the subjects a bit and tried to burn down some of the more irritating hotspots in the picture.
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Great idea. Good execution (at least on the right side focus). There are some distracting artifacts in the overlap on the left. + points for degree of difficulty.