My faves...
Aliens: Massive explosions supplemented by unprecedented rates of automatic gunfire. Some characters and talky stuff as well.
Terminator 2: Here the bombs & bullets don't fly quite as furiously as they do in James Cameron's entry in the Alien series. However, the explosions score high marks for technical quality.
Predator: The pretext of advanced alien technology is used as an excuse to generate a long series of powerful explosions. Brilliant!!
The Matrix: A seemingly flimsy and unbelievable plot-line comes into it's own during a climactic chase scene punctuated with kung-fu action and gunplay. Sports one of the most unforgettable explosions in film history.
When Harry Met Sally: Heh. Just kidding.
Cyborg Xenomorph and the Explosioneers in Cyberworld: Actually, this is a script I'm writing myself. This film will have everything that audiences have come to expect in a life-affirming cinematic experience: Grenades, mortar fire, heat-seeking buzzsaws that explode on contact, you name it!
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"You'll burn for this. Burn in jail!"