Want bigger boobs? Bigger virtual boobs? The 3DS augmented reality cards are being used to make mountains out of molehills, as evident in his video. This trick isn't limited to the 3DS only - any AR camera set-up could conceivably make this happen.
Don't stop at flat chests! As website Tiny Cartridge points out, feel free to put boobs on just about anything.
Increase your bust size with the Nintendo 3DS!... [Tiny Cartridge]