If all your friends jumped off a bridge, would you? How about if some strangers on the internet vacuum-sealed themselves into plastic bags? For many people, the answer is a big dumb "yes"! This new viral challenge may look fun It may look like fun but it could potentially be dangerous, leading to cerebral hypoxia, a condition in which there is “a decrease of oxygen supply to the brain even though there is adequate blood flow. So be careful all of you people who are trying to get share of internet fame!