I recently screened it for my teenaged sons and it was great to see someone who knew nothing at all about the movie experience it for the first time.
"Dad, that's what they call "black humor", huh?"
"Oh, yes, son, very much so".
I had to add a few historic facts in whispers here and there just to help orient them a little bit, but they quite enjoyed it, and we'll follow it up with "Fail Safe" and "On the Beach". They are still too young for "A Boy and His Dog".