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I'm sorry to resurrect such an old thread, but do you remember seeing old cartoons where, when the character was hit by something on the head they saw stars flying around their head in circles (think Tom and Jerry)? That's exactly what happened. It's because the section of your brain that's in charge of visuals is near the back of the head, so when people get hit back there hard enough, they "see stars". When your brain gets hit, stimuli are created within it (think about a bunch of active exposed electric wires, all close together, and what happened when they crash together). When it happens on the back of your head, your sight gets over stimulated, and so you see stars.
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