I don't mean the ones we know about already - things people wouldn't think you did or enjoyed to look at you.
I love watching Ray Mears Extreme Survival and learning about how to survive and find food and shelter in extreme climates even though there is a strong possibility that I shall never try and escape naked from a Japanese Prisoner of War Camp, or crash without a flagon of water into the Sahara, or come stuck in my ship in a freezing ice plateau in deepest Antartica.
What's your guilty geeky pleasure?