Since I started working for a cell company, specifically in the 'building the towers' area, DP is obsessed with them. Cracks me up when we go on trips and she's asking me what kinds of antennas are on structures, and playing 'spot the stealth tower'.
My grandfather was a BellSouth man (Southern Bell when he started there) and still talks about switches, and line, and poles, and how this technology works.... he's got some really cool pieces in his telephone history collection, too - not just insulators and old phones, but (my favorite) a old pay phone coin box cover from the Olympics where they changed from Southern Bell to Bellsouth - I think it was in the 80s.
I'm a Disney geek, but mostly a Magic Kingdom geek. I can (well, could, until they did the most recent renovations) walk around blindfolded and show you every restaurant, shop, bathroom, water fountain, ride entrance, service entrance, character greeting place, mobile cart stopping spot, and hidden Mickey in the place. Of course, that's all dated to the early 90s now, so I'm still useful but not nearly as 'scary' as I used to be in the parks - mom and dad were amazed that I knew the best way to get everywhere in the park, but could get lost on the way home from my school, which was five blocks in a straight line from one to the other.