Thai food takeaway container: check
weather balloon + helium: check
iphone, parachute, handwarmers: check
Launch! 
Bloody impressive 7 minute video at...
www.brooklynspaceprogram.org/BSP/Space_Balloon.html
New York Times story at: www.nytimes.com/2010/10/12/science/space/12weather.html?ref=science
Pretty cool!
Meanwhile in downtown New York, people were ringing the cops to tell them they'd seen a UFO... 
[}:)]
I had a mate who thought it was funny to do that to a mouse with about 15 helium ballons... poor mouse 
