Very few people saw Empire of the Sun when it came out 21 years ago, and possibly even fewer people remember it. But the effects of that World War II film — one of Steven Spielberg’s most underrated efforts — live with us still. It introduced the world to a 13-year-old kid from Wales named Christian Bale, who has since conquered the box office as The Dark Knight. It also featured a young man named Ben Stiller, in one of his very first roles, as a prisoner of war named Dainty. And it was while working on that film that Stiller first got the idea for Tropic Thunder.