Just to follow up on that (and agreeing that as an intern this probably wouldn't fly), but when I started at my current job the employment agreement had some intellectual property clauses that simply wouldn't work, since I do occasional client work on the weekends and contribute to open source projects. It was most likely because I was the first full-time software developer hire (previously, software was written by contractors). I simply told them I needed to make a couple of changes to protect both of us, crossed off the offending sections, and attached an amendment to the contract using some standard boilerplate I found online that protected both of our interests fairly. Everyone was cool with it, we signed it, and everything is copacetic.