I've loved They Live since I first saw it back in my early teens. So much so that I wrote a paper on it in my freshman year at college. It's great (or probably more frightening really) that the movie seems to be so timeless with it's message. Easy pick for the Canon.
I guess I'll attach the paper for anyone who's dedicated enough, since it's not doing much just sitting on my hard drive.
FMA 102 Final Paper.pdf