One thing we don't have enough of is Western movies with giant monsters. There's Valley of the Gwangi (1969), and uh, that's about it. But now Fabrice Mathieu (previously at Neatorama) brings us a mashup with gunslingers defending the Alamo from a swarm of giant mutant insects! Far Alamo stars John Wayne, Charles Bronson, Yul Brynner, Richard Widmark, James Coburn, Clint Eastwood, Henry Fonda, Lee Van Cleef, and a host other actors you'd expect in a classic Western. This shoot-em-up was pieced together from a dozen different films, listed at the vimeo page. -Thanks, Fabrice!
Did you forget Cowboys & Aliens?
https://www.youtube.com/watch?v=zH7KZD5vGBY
Guess the aliens weren't all that big . . .