This was my favourite subject throughout both my bachelor and masters degrees. It changed the way I understand the universe, which is pretty awesome. I was hooked, and the material has proved to be extremely useful to me as I'm now doing a PhD in quantum chemistry. Be warned though, it was pretty hard. Back then, the guy teaching the special relativity section was new and inexperienced, but that's probably not as issue any more. (I took this subject in semester 1, 2013, but that doesn't appear in the drop-down menu, so I'll select semester 1, 2017, which is the oldest option available.)

Interesting subject matter which is well taught by engaging lecturers. Contains abstract core concepts but perseverance pays off.