A surprising percentage of the population suffers from what is known colloquially as "lazy eye". This means that even though both eyes work, they don't have properly functioning stereoscopic vision. Such people would be completely wasting their money buying a 3D TV, and would be recommended to have an eye test first. Or, if they're cheap buggers, they could get somebody to take their photo with a flash camera and see how many red eyes are staring back in the resulting photograph.
"Standing on your mother's corpse you told me that you'd wait forever." [Bryan Adams: Summer of 69]
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