The idea of due process can be a difficult legal concept for a lot of non-lawyers. But you can get the basic idea from Monty Python's classic movie, Monty Python and the Holy Grail. You just need to watch a single scene, the "she's a witch!" scene, which is here:
You probably remember the scene, at least if you're of a certain age. To recap: The mob has found a witch, and they're very excited to burn her. They come to Bedevere and ask for his permission to do it. Bedevere pauses and asks, "How do you know she's a witch?" The crowd can't come up with a good reason. Bedevere then insists that there are ways of telling if she's a witch, and he leads the mob to a scientific test of that proposition.
