Both of these movies involve tragedies set in high schools. At one time, 2:37 was accused of ripping Elephant off but aside from one tracking shot, I think they're very different looks into how the worse thing imaginable can happen within a school.
2) Black Sheep/Tommy Boy
Nostalgia pick! I used to watch these two films back to back all the time when I was a kid. In fact, sometimes when I think of a specific scene, I struggle to remember which movie it was from.
3) The Big Short/99 Homes
Both of these movies tackle the American housing crisis in 2008, but they look at it from different sides. The Big Short shows us the rich Wall Street workers that pulled it off, and 99 Homes shows us the poor people that suffered.