This past Thursday, NBC's Community aired its "Modern Warfare" episode. It is quite possibly the funniest half-hour tribute to action movies that I've ever seen. Off the top of my head, I saw references to Pitch Black, Terminator, The Replacement Killers, Cheers, Glee, Gladiator, and last, but definitely not least, Die Hard.
Check it out here.
What references did you see?