The Martian was the highlight of this marathon, for me. Or rather... seeing it with that particular crowd!
For those unaware, this scifi marathon, unlike ours or Boston's, is not for-profit. Instead of being held at/organized by a commercial theater, it is organized by the Case Western Reserve University Film Society, a student organization, and held at the Strosacker Auditorium on campus.
Also, Case Western is a big engineering school - of it's nearly 5000 undergraduate students, 1144 of them are in the Engineering school - it is their biggest undergraduate program.
So, anyway, The Martian was the 3rd from last film, starting at around 7pm Saturday. The marathon had been going for almost 24 hours at that point, and, as always at these events, the crowd had been gradually thinning out by then. I got up to use the restroom about halfway through the previous film (The Blob), and didn't think anything of it at the time, but did notice a larger than usual crowd hanging out in the lobby. For the rest of The Blob, I started to notice a lot of people coming into the theater looking for seats. At first I just thought this was people who left to nap for a few hours, who were now returning (you get a lot more of that in Cleveland, than Columbus or Boston, due to the longer overall length of the marathon - 30 or so hours).
But then, when The Blob ended, it was like the floodgates opened... all of a sudden another 100 or so people flooded into the theater... it was actually difficult for them to all find seats, the theater became so crowded. I wondered what the heck was going on... these were clearly NEW people coming to the marathon, but why would so many new people join the marathon with only 3 movies left?
One of my friends then pointed out to me that The Martian was the next film, and since the Case Western marathon allows single movie ticket purchases (for $4), and has such a prominent engineering school - these were probably mostly engineering students, who wanted to come bask in its celebration of science.
And, sure enough... it was like seeing the first Lord of the Rings movie, at the midnight premiere screening, with a full theater at a Ren-Faire. Or, something like that.

I can't think of another film I have ever seen, with a more participatory audience (well, excluding RHPS or MST3K type audiences, who look at movies as opportunities to call out their own witicisms). The applause breaking out every time another problem was solved, was infectious, and so much fun! I think what made it so memorable to me was that it wasn't the usual fan-nerd type of appreciation of fan service (like when the audience erupts into applause at Star Wars: The Force Awakens, when the Millenium Falcom first appears), but, rather, science nerds celebrating being appreciated. It was a lot of fun to be a part of that with them - even though I'm not a scientist.