The Boy In The Stripped Pajamas What Is The Ending To "The Boy In The Stripped Pajamas?"?

What is the ending to "The Boy in the Stripped Pajamas?"? - the boy in the stripped pajamas

I hear the end of The Boy in the Stripped Pajamas is very extreme and absolutely terrible. I read that a review even said: "If you do not run screaming from the theater in the last 15 minutes of the film, what's wrong with you."