A bit of an odd cases here I guess, as I'm actually fairly quick to recommend Neon Genesis Evangelion.... but I never do so without warning about its very polarizing nature. To say the series is "love-it-or-hate-it" is likely an understatement of all things.
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For something which is probably a better answer to the topic question...
Structural Engineering & Bridge Design
Engineering as a whole tends to be a challenging profession, even when you're still in the middle of obtaining your undergraduate degree; but for the most part it's not too daunting, at least once you get used to your course load (a big leap from high school). For those who choose to go into civil engineering, a common reason for that decision is because they want to get into structural; more or less the logical conclusion of playing with Lego and K'Nex (or any other "building" toy) when you were a kid. Many of the courses these students do eventually lead into structural design, but oddly enough (at my university at least) only the first structural design course is required (and it's a third-year course to boot); the two follow-up courses are technical electives. A bit of an oddity, but it became quite clear when I finally took the course:
Structural design is absolutely not for sissies.
The most demanding set of courses I have ever taken, period. The amount of material being thrown at you increases to a break-neck pace, as you're pretty much being taught how to use the design handbooks which professionals do; you do not want to be playing catch-up in these courses. Furthermore, you don't get the benefit of a quick review at the start of these courses (if you do, it's only because you'll be doing the more advanced version in about five minutes); you're expected to know the basics like the back of your hand, and how to apply them. This is in comparison to every other sub-discipline, which are quite tame in comparison. The class size has noticably shrunk over the past semesters, the only ones left in structural are those who really like it.
Bridge design is a particularly special beast as well, a specialization of it's own within structural engineering. As a bit of a stroke of luck, I'm actually getting to cover it during the last semester of my undergraduate degree; it's not covered every year at post-graduate level, let alone the undergraduate level. Anyhow, the main reason it stands out is due to how differently a bridge acts compared to other structures due to the volume of moving loads which go across it; they also have a tendency to be (or become) vital infrastructure, they have to be built to last.
But yes, despite how daunting structural engineering and bridge design are... I'm just liking them more and more as I keep learning about them. I guess there's a bit of pride at play as well, though it's something I'm about attribute to my own talents; if anything, structural design drove home the point that talent alone is not enough. If you want to do this, you need both the sharp mind to learn the subject matter (and if you made it far enough into engineering to reach an actual design course, you got that)... and the tenacity to keep going as it kicks your ass every step of the way.
I suppose you could vaguely compare it a game like Dark Souls, if the amount of challenge was multiplied ten-fold (if not more). It's hard, frustrating, and very rewarding once you finally "get it" (even when it's one of those small little triumphs). Quite a bit more at stake than any game, that's true... but the parallels of the experience are still surprisingly similar.
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How does that saying go?
"It doesn't matter how many times you fall down. What matters is that you get back up."
Whenever that saying can be applied to something, it's hard to recommend to anyone... but if you're able to take the beating as you learn how do it well? You'll start to not only do great, but also enjoy doing it.