My stepdad and dad were both volunteer fireman when I was young, and in fact, my stepdad has stayed involved with the department. I've actually been looking around for a cheap Bearcat of some nature with 30 or 50 channels to get him so he can keep up with them when he hears a call go out.
My dad also worked at the Wyoming Women's Center (the state women's prison) for several years, and my best friend from about third grade up until he graduated was the son of a local police officer. So I had their old pagers to listen to when a page would come in, and also my buddy's dad's scanner which was always running.
Given the nature of their work, I kinda wanted to know what was happening with them. Now, I keep an ear on things because here in this little Wyoming burgh, we have no media past the local newspaper (which is pretty much a tool of the city council as far as I'm concerned), so it's nice to know when things are going on. I used to live on the local bar crawl, and now live less than 100 yards from the railroad, so aside from keeping my door closed and locked at all times (sometimes a rare thing in WY), if there's an incident near me, I like to know about it.
However, I also work for the university, and one of our phone patches for our tech issues is one of my frequencies on the GRE, which is kinda fun sometimes. Walk in, give crap to one of the engineers for something I heard on the radio. It's also a lot of fun during gamedays. I've also gotten into air monitoring, but need to get a better antenna, and when there's a power outage, Rocky Mountain Power is always interesting, so my interest has grown considerably.
Actually looking to get into shortwave listening soon. Been reading, just don't have time with my job right now, though two of our engineers (goofy old guys, at least in comparison to my 26 years, with big mustaches and guts) are hams, so between them and this website, it's not like I'm without direct, personal (at least moreso than a book would be) resources to figure things out.