I know I'm a bit late with this, but I thought I'd share it anyway.
A few years ago me and my friend were messing around in computer class and I decided to look at the network devices.
I couldn't believe, what I saw. All of the school security cameras were there, and the best part: when I connected to their ip addresses, they were just showing the live feed, no password or anything.
I didn't really do anything with it since I couldn't think of any great ideas and it has since been fixed.
Technically not hacking but still somewhat related.