I voted Kickboxer based on the number of times I've watched it, but The Last Crusade, Batman, Major League, and Lethal Weapon are all great fun. Glory and the Dead Poets Society are great films. There is the scene from Glory were the recruits are congratulating the best marksman for hitting a small target or something when Mathew Broderick's character intervenes. He tells him to do it again, faster, yelling at him and pointing a pistol at his head to illustrate that they were emphasizing the wrong things in their practice; speed under pressure being far more important than slow, leisurely target shooting. I've seen it used several times in training and quality control videos to point out that you have to teach and measure the things that actually make you better. A powerful and tense scene.