When I was in college, registering for classes was always a pain since a lot of classes would fill up almost instantly once online registration opened, then it was just a game of constantly refreshing to see if any seats had become available.
After struggling through that for a few semesters, I decided to automate it. Started out with a script that would take course IDs as input and check for openings every few minutes (used selenium/beautiful soup I think) then text me via twilio whenever a seat was available. The next semester I updated it so it would even sign me up for the course automatically.
Also came in handy to get myself and a few friends into the coveted wine tasting class our senior year.