Flubber is a blast to make and your kids will spend endless hours playing with it. It is the perfect indoor activity when the snow, rain, or (in my case) heat keeps you indoors. Your kids are limited only by their imaginations when they are given a big, rubbery pile of Flubber to play with. Even older kids will have a great time using it to play practical fart jokes (Windbreakers). Note: Use liquid watercolor for this recipe, do not use food coloring!!