The kid's movie UP, while serving it's purpose as a kid's movie, isn't exactly known for being accurate in the physics department. In the movie, an entire house is lifted up by nothing more than balloons. This iconic scene is pretty, but is it probable? Discovery channel's Mythbusters decided to test it harnessing a small girl into a ton of balloons, and seeing how many it would take to lift her. They estimated about 2000 fully inflated helium balloons would be enough to lift the young girl, but with a sandbag dummy they found they would need upwards of 3500 balloons. After tying up all 3500 balloons to the harness, she was lifted into the air purely by the power of balloons. If it took 3500 balloons to lift a small girl, it would likely take millions of balloons to lift a house off of it's foundation and then into the air.