AR Hacking
When you think about starting points for hackers what comes to mind? For many people images of Arduinos and Raspberry Pis connected to strange looking robotic parts are the first things they think of. But there's no reason you have to start there. Deviant did a good presentation about hacking the AR-15. If you're into firearms and want to get into hacking it's a good video to watch since it explains how the two intersect very well: