Which parts of Don quixote do you find humorous but meaningful?

One meaningful story that comes to mind occurs when Don Quixote comes upon a landowner beating his servant. Quixote intervenes, meaning to do good. He compels the man to stop the beating. However, as soon as he leaves, the landlord beats the servant even more brutally. This is very dark humor, but it brings up an important point: while it is important to not be silent bystanders to violence and injustice, we need to think about our interventions to make sure they don't do more harm than good.
But perhaps my favorite humorous story is the one where Don Quixote tilts at windmills. He sees thirty or forty windmills in the distance, and he thinks they are giants. He runs at them on horseback, attacking them, all to no purpose, as they are windmills. The phrase "tilting at windmills" has become famous to describe idealistic actions that are doomed to failure before they begin. The story, like so much in Don Quixote, causes the reader to think: do we admire Quixote for acting out of good, if misguided, impulses or do we condemn him as a fool?