Pacific Rim is a movie about humanity's war against the Kaiju, a race of giant monsters. For some reason, our solution is to build an army of giant robots (Jaegers), to engage them in hand-to-hand combat, despite weapons being invented in, like, 10,000 BC. In the first fight scene, it's revealed that the Jaegers are equipped with some kind of plasma cannons, but they take too long to charge, so punching is the best they can do. In another scene, it's shown that the Jaegers have rockets attached to the backs of their elbows to maximize their punching power, rather than, y'know, firing those rockets at the enemy.
"Shit ... I was aiming for the dick."
A full hour and 30 minutes into the movie, the hero's Jaeger is so badly damaged that it resorts to using a cargo ship as a baseball bat, destroying half of Hong Kong in the process. Right when all hope seems lost, his copilot suddenly remembers that they also have a massive sword, which they immediately unsheathe and use to slice the Kaiju in half in one effortless strike.