It takes a careful balance of plausibility and absurdity to make a really good hoax, and these two videos pull it off beautifully! I mean, c’mon, the average person doesn’t know that much about the chemical properties of helium or how much weight a bubblegum balloon could potentially carry, nor do they really know the tensile strength of water. With the right special effects, you can convince anybody of anything! I know more than a few people who have been fooled by these clips.