Are Aliens Already Among Us?

Now THAT is an alien!
Now THAT is an alien!
I realise that the question may seem absurd, but by "alien" I don't necessarily mean what you see in the picture above. I'm thinking more in terms of the mind, the way that people process information, understand the world around them, and the way they communicate with others. For example, I actually had a debate (perhaps one could even call it an argument) with someone over the difference between the words 'deny' and 'defy'. I tried to explain to him that the two concepts were not at all related, even going so far as to create a link to an online dictionary to show him, but he just couldn't understand.
I also believe our reality really is peppered with NPC's. I see them a lot. For those who don't know, an NPC is a 'non-playable character'; that is, an image of a person in a computer game that is just a part of the programme, and which displays all of the characteristics of being completely mindless, robotic and predictable. I've met a LOT of people like that over the years, people who apparently do not have a soul.
Are Aliens Already Among Us?
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