Say the phrase "Waterworld" and chances are you'll think about one of two things: 1) it being a box office disaster; or 2) how Kevin Costner's hero drank his own pee. The most expensive film ever made upon its release in 1995, it famously cost almost $US180 ($225) million but grossed only $US80 ($100) million in the US, making it one of Hollywood's biggest bombs at the time -- but somehow, it's lived on at Universal Studio Hollywood as a live-action stunt spectacular for over 20 years.