Remember when "everybody's doing it" was reason enough to dive in headfirst? From gravity-defying flagpole sitting and phone booth cramming, to pet skunks and goldfish gulpers, we reveal the wildest crazes that once swept the nation. These over-the-top obsessions were risky, and impossible to resist. It's a jaw-dropping, head-shaking trip back to the fads that pushed the limits and made our hazardous history must-see mayhem.