As a kid, you probably remember slurping down multiple juice boxes of Ecto-Cooler, an artificial neon-green colored citrus drink from Hi-C. The beverage, made to promote the Ghostbusters movies, was said to be made with "ghost ectoplasm," which sounded really cool when you were eight, but as a boring ol' adult, it just sounds gross. Now with the new Ghostbusters movie out, Ecto-Coolers have also made their triumphant return, and although you may think you are too mature to drink it, Jimmy Fallon is definitely not too mature to jump into a pool filled with the ghost secretion juice.