Coincidentally, universities are the absolute worst when it comes to "we own everything you ever do or think of" clauses in employment contracts, even if you're not a student or in a teaching/research position.
Those sorts of clauses really suck the fun out of life. "Gee, I'd have a hobby and share my work with the world, but my employer owns everything I do. I think I'll play video games instead. They can't take that from me!"