The two types of plot

Somebody once told me that there are only two plots in all fiction: boy leaves home and stranger comes to town. As metaphorical as they are, I'm not sure I trust it. Let's have a look at various film, book, and TV things:

• The Road There's a lot of leaving home going on here. They find that nice bunker full of peaches and then they leave again. So it happens more than once.
• Doctor Who In general this seems to be both. The assistant leaves home because the Doctor has arrived, who is pretty strange.
• The Bourne Identity He's on a journey, but was he ever at home to begin with?
• District 9 Lots of scaley strangers coming to town. Also, the protagonist is turning into an alien, so that can't be very comfortable.
• The Lion King It's Hamlet, right? And in Hamlet people go mad, which is strange. This is maybe stretching it slightly. Shakespeare is awkward.
• Taken Boy leaves home to kill everyone in France. Technically he's an ex-CIA operative, but lets say boy.
• A Knight's Tale He's definitely leaving home here. He goes back at the end but that doesn't count.
• Pride and Prejudice Stranger comes to town. In Jane Austen it is always stranger comes to town.
• Lost Everything at once from ten different viewpoints and alternative timelines. Also: polar bears.
• Lord of the Rings Probably the definition of boy leaves home.

Does it work? Maybe. But then you could easily write a story that doesn't follow the rules, just to be sly. I did not include sly artists in this list.