The TV show Son's of Anarchy always has a few good knives in it. They usually show a Ka-Bar USMC and a Buck 119 of which I have both.
I know its not a movie but it is the best I could do.
Sons is a great show; can't wait until its back this fall. The character Trigg carries a Cold Steel Kobun on his belt as well, if I recall correctly.
No blades from a movie here and the only blade I've picked up specifically due to a TV show is my Busse Team Gemini Light Brigade. Daryl Dixon makes good use of it throughout the Walking Dead TV series dispatching walkers with extreme prejudice. The real reason though is that its a heck of a useful blade rather than just a prop and will likely outlast the apocalypse, Ragnarock, etc and be drawn forth from a stone at some distant point in the future to save a kingdom. It really is that impressive in the hand. Its also backed by one of the best warranties in the business and took all of a day to become my favourite all-around blade.
