We saw this story on the news this morning and thought it was pretty impressive. Two Canadian students, Matthew Ho and Asad Muhammad, used a weather balloon and foam box to carry four cameras and a toy Lego man high above the clouds. It reached a height of 24 kilometers into the atmosphere before bursting. This is around three times the cruising altitude of a commercial airplane.
Having attached a GPS receiver to the foam box carrying the cameras and Lego man, the two students were able to track it down, along with their homemade parachute, in a field 122km from the launch site. You can read more on the story here, and watch the video below.