Cowboys and Indians, cops and robbers, Michael Bay and explosions -- all of these things go hand in hand. But cowboys and aliens? Not so much ... until now. In honor of the genre-bending new film 'Cowboys & Aliens,' we here at Moviefone have put together a mashup of the best cowboy and alien shoot-outs in movie history. So if you ever wanted to watch John Wayne gun down an alien, you've come to the right place.