I vividly remember watching Battle Royale with my college roommate, and when it was over, we looked at each other and said "this would be an incredible premise for a video game". This would have been like 2004. We even tried to mod it into the original FarCry engine (the island setting was perfect), but it was too difficult for us. Too bad we didn't actually have the chops to do it, could have gotten the jump on Fortnite/PUBG by over a decade lol. Really wish we had stayed motivated, looking back on it.

edit: But yes, Battle Royale is a great movie, and Hunger Games totally rode its coattails.