Okay, so, I'm no scientist, but I'm not sure that it's possible for a planet's gravity to pull you up instead of down, and two planets in extremely-close orbit would probably collide, and I'm also pretty sure the gravity of the planet you're from doesn't follow you if you leave. But that's just me.
The new Canadian fantasy film Upside Down plays with gravity in a way that may be completely unbelievable, but at least it's visually interesting. Check out the trailer:
In an alternate universe, two twin planets in close orbit contain two very different societies. Up is rich and down is poor, and travel between them is banned. Jim Sturgess (Cloud Atlas) stars as Adam, a man from Down who struggles to reunite with his lost love Eden, played by Kirsten Dunst (Spider-Man), who is from Up.
Upside Down is written and directed by Juan Diego Solanas. It premieres March 15.