We all have at least one -- one thing we do that everyone gives us a slightly weird look and a cocked eyebrow for doing. Well ... all right, maybe a few more weird things than that. But there's that one thing we do that just makes sense to us, and we have to defend ourselves for it every time someone finds us out.
For me? I hearth to Darnassus. Yes, before you ask, I do have a love affair with night elves; however, that's not the reason. When I first started playing WoW (and Cutaia can vouch for this), I always found myself around Darkshore. For a good year or so, I never really did any leveling; I stayed around level 15 and stuck around the Darkshore area. Being so close to Darnassus meant I was in the city all the time. I figured out where everything was, and I liked the atmosphere.
Now, I'm level 85. Sure, I teleport to Stormwind when it's necessary, and I know where everything is now ... but I still have my hearth set to Darnassus. I tell people now that it's for my frame rate on my laptop, but it's still more comfortable for me. You can bet with cooking and fishing dailies added in 4.1 that you'll be seeing me in Darnassus quite a bit more.
What's your weird WoW quirk that you actually have a reason for doing? No judgements here.