Button wins the last two races. No matter what the rest do, that’s a pretty crazy scenario.
For real though, Button wins the last two races, Hamilton gets a 3rd and 5th, Vettel a 2nd and 3rd, Webber a 3rd and 8th, Alonso a 6th and DNF. Alonso wins the championship by a win from Webber and Button, two from Vettel, and one point from Hamilton.
But I think yours is even crazier as it’s pretty conceivable it could happen!