I'm a mechanical engineering student going into 3rd year and in my university I am able to take one class per semester from anywhere in the college. Just as long as it isn't a first year class and it fits in my schedule.

Unfortunately, one of the electives I really wanted to take doesn't fit my schedule, but with so much choice I'm finding it hard to come up with an alternative.

Right now just so I was able to finish registration I signed up for third year Signals and Systems under the school of Electronic Engineering. By the description though, it sounds like it could be complex circuit analysis which I really don't want to get into.

I was also looking at 2nd year Critical Theory with the school of English. However, although it looks really interesting, I don't know how much value it would add to my degree.

Another one I found were 3rd year Stellar Astrophysics, however having only taken one class which rolled quantum mechanics/electromagnetism/optics into one, I don't know whether I'm well versed enough in the field to really do well in it.

So, anyone who went through university, what were some of your favorite/most useful classes? With so much range there has to be some non-engineering classes that will still translate useful skills over.