Even if you've never slept or sat on a waterbed, you've surely heard of the uniquely fluid mattress alternative. The water bed was invented in 1968 by Charles Hall, after he was given a college design assignment to "design something to improve human comfort." Hall, inspired by the warm comfort of a whirlpool bath, filled a chair with Jello. The resulting chair weighed 300 lbs, so he tried a different approach. He created the "Liquid Support for Human Bodies" patent for the waterbed, which was an instant hit among his classmates. The rest of the country latched onto his innovative creation, and waterbeds took off. During the peak of their popularity in the 1970s and '80s, waterbeds made up one out of every five beds sold. More than 40 years later, Hall has said it's time for a new and improved waterbed to make a comeback. We've collected some awesome videos on this topic. Watch them now to learn more.