What's Your Favorite Movie Alien?

I know they're toys not aliens, but they're adorable.

The human inhabiting parasite in John Carpenter's masterpiece. You know... they call 'The Thing' ?

No picture?... oh, wait, yeah... it could be anyone.

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I agree. This is probably the biggest nightmare alien imaginable, especially when you think about all of its many ominious implications. The film's suspense/mystery over who is human and who is alien makes it a most intense viewing experience, at least the first time we watched it.