Discrete math and Algorithms were two of my favorite college classes. They were really the only part of computer science that was mind blowing. The rest was software engineering, which was transparently "possible". Like, yes, big programs and OSs and numerical models exist, and yes I will graduate and work with them and add to them, someday, yeah sure.

But decidabilty, Godel's theorm, busy beaver numbers, etc... those were unexpected and worth the price of admission.

Thanks Prof Hadas, you made it fun to have my mind blown.