The latest season of YOU HAVE BEEN WARNED brings you a brand new countdown of the world's top 20 outrageous YouTube videos featuring homemade science stunts and experiments. Amazing storytelling graphics and a breakdown by experts reveal the what, how, and why of the science that made these clips possible. Witness epic fails, spot the fakers from the makers, and encounter the cleverest, funniest, most daring or just downright bizarre clips from around the globe - from a one-wheeled motorbike in the United States and tiny helicopters that can lift a woman in Germany, to a Brazilian man who can hold his breath for more than 20 minutes and a Finnish man who can fly with his own rocket boots.