When i did the last mission on hard, i had killed everybody, but had no ammo or health left, and just had the bunker guy and the rpg guys left shooting at me, and i was running back and forth on the catwalk with no hope. So eventually i just said screw it, went springing across, picked up some random gun with 2 or 3 rounds left (some kind of revolver or something, i haven't played it in a while) and started firing wildly, like a madman, and sure enough, that whole side of the room blew up. mission accomplished!
Another time i got right up close to the bunker, killed the dude, and was wiped out by the ensuing explosion, that was a new degree of anger. --- (Yes, I know "ferari" has 3 r's)