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					Originally Posted by  Dr. Drib
					 
				 
				Here's a link to the full story right here, and also here's the full story.  It's called "Knock": 
http://en.wikipedia.org/wiki/Knock_%28short_story%29
Since it's on Wikipedia, I'm listing the story here.  (If it's still under copyright, then I'll remove remove it when I wake up tomorrow morning, unless I die in my sleep of course.)    
The last man on Earth sat alone in a room. There was a knock on the door...
Don  
			
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 That is one of my favorite episodes from Dimension X. You can find it here (5th one down): 
http://www.archive.org/details/OTRR_Dimension_X_Singles
I think that those two sentences are probably the best opening lines of a Science Fiction story ever.
Joe