When I'd relate hobbies I usually point out video games, and the technical related issues that arise when fine tuning a machine to play games optimally. 
Not always, but it highly depends on the interviewer, and how comfortable I feel speaking about it.
I've mentioned it during my past few interviews. 
The job I got in February, I started speaking, then realized I should use example, otherwise leaving off abruptly may be awkward, so explained steps I did in resolving a game related technical issue. After I got the job we spent alot of time talking about video games.
During last interview, dude was around my age so it was easier to come out and blatantly state it as experience.
Other times I'll speak about hiking or geocaching if comfortable & opportunity arises. One of my best interviews I spoke on that. After getting all the BS out of the way, we agreed it was a nice area to hang out in, & I stated I'd be in the area for several hours geocaching. She spent the rest of the interview asking questions about it, I also wrote down the website on my card for her.
If not for car accident, turning the highway into a standstill, making me go from 30min early, to 20min late, I would have gotten that job...