When I was a kid, Ender's Game.
The movie is garbage, it's not worth watching. The most interesting stuff happens in the main character's internal dialogue.
The main character is an intelligent outcast and that thinks differently, very enticing to a kid that feels the same way.
Ender's Game was on the U.S. Marine Corps' reading list.
(I might have read Ender's Shadow two or three times as well.)