Ask HN: Ideas for a CS Senior Project?

So I've just started my senior project class at my university, I'm a computer science major but my curriculum has been more software development than CS.

My teacher wants us to come up with something that will fix a new problem or change a new industry, something "disruptive". Made me think of startups so I thought this would be the perfect place to ask.

Any ideas are welcome really, he would like us to do a mobile/web app but if our idea is good enough we can do anything (dev tools, commandline/desktop app or whatever). We have a team of 4 with 3 months to do it, we're supposed to put in about 500 man hours of work into the project.