in this youtube video and commercial
( http://www.youtube.com/watch?v=1l_v1K3GwUc )
can you really tape off your cloths with duck tape, fill them with helium, then walk around and float like an astronaut?????

Busted for at least 3 reasons:

1- denim won't hold helium
2- pants won't hold nearly enough helium - as they've already shown on the show at least 3 times.
3- even if you COULD float by filling your pants with helium, you'd do so upside-down.

To continue Preserved K's list
4- helium has the ability to lift about 1 gram per liter. A 150 pound person would require about 68,181 liters of helium to lift them.