Very true. I can see that Edge of Tomorrow, Limitless, and Source Code are all PG-13, so he might want to start with those.
Edit: At the same time I feel like these suggestions (including the R-rated ones) are all wonderfully simple, understandable, yet though-provoking and constantly entertaining. Perfect for anyone that finds 2001 to be a slow and tedious movie. I would really want to trust that it's safe for anyone to watch these as long as they have an adult next to them, and someone they can talk about the movie with after.
Edit: At the same time I feel like these suggestions (including the R-rated ones) are all wonderfully simple, understandable, yet though-provoking and constantly entertaining. Perfect for anyone that finds 2001 to be a slow and tedious movie. I would really want to trust that it's safe for anyone to watch these as long as they have an adult next to them, and someone they can talk about the movie with after.