But It's Suspiciously Similar To ...
Above Then Beyond is an animated French short about a lonely widow whose home faces demolition by evil businessmen because it's the only house left in the middle of an urban development.
The sharply dressed bastards then show up to bully her out of her house. And after being served with an eviction notice, she turns her house into a gigantic hot air balloon and floats off into the clouds. You have to admit, that's a pretty bizarrely specific plot to have occurred to two different filmmakers. SlashFilm did this side-by-side comparison:
Aside from the fact that the protagonist of Up is an old man and not a woman, the only real difference between the films is that in Up, the old man goes on a bunch of zany jungle adventures with a fat kid and a talking dog, whereas in Above Then Beyond, the old lady dies and it's revealed to be a dream she had.
Before being murdered by skinheads.