My comment may contain SPOILERS for Interstellar, fair warning.

Interstellar is my favourite too. I rewatched it recently, and as always I struggled to make it through without crying.

When I first watched it as a teenager I was astounded by the spectacle and visuals of Cooper's journey.

Now that I'm older, those things still excite me, but I'm more affected by the relationships in the film. The tension in the crew as they struggle to make the right choices. The betrayal by Dr Brand, when it is revealed that "Plan A" was never possible.

And of course, the relationship between Cooper and his daughter. I'm not a father yet, but I'm reaching an age when I'm thinking about it, and I think that's why this affects me so much. When Cooper departs from Earth, not knowing if he will see Murph again. The video messages he receives after visiting the water world, where he learns that he missed out on most of his children's lives. And of course their eventual reunion when Murph is an old lady in her deathbed.

What that man went through is unimaginably horrible.

I watch that one at least once or twice a year! The whole plot is very well written.