Ok, why the poison? Maybe the owner simply wanted to do something cool. It's a better life for the domain to be used for the movie, more people will enjoy it and you get some toys and some bragging rights. It's an URL, not a wife. You can give it up simply if you want to be nice. You don't _have_ to, of course, and that's important, but it doesn't mean you shouldn't if you feel like it.