You're a Tolkien geek if you react to disruptions of your daily routine with the words "What new devilry is this?"
You're a Star Trek geek if
- you tell the colleague relieving you when your shift is over "You have the bridge, Number One."
- you say of someone who talks very quickly "They're talking at full impulse."
You're an Elder Scrolls geek if
- things stink to High Hrothgar for you (instead of high heaven).
- as a driver dealing with a tricky traffic situation you cry out "Nerevar guide me!"