I actually just let the cat out of the bag here at work.
That is, I'm taking vacation days to attend GenCon, and a large group of Engineers wanted to know where I'm going and why.
I explained, and even had help from one of the younger engineers interjecting "You know, that D&D thing" for the benefit of one of the older.
The group concensus after my revalation?
"Oh. okay."
The older engineer then asked if I "dress up" because he had a friend who is (was?) a LARPer.
A few people in the company knew anyway, as some I told (most of these play computer games and such) and others had been to a large party at my house where they admired my shelves of RPG books and thousands of painted miniatures. Kind of hard to play that one down. And not as akward as one might think.
And with this swell economy we're experiencing, there's no need to worry about whether or not this will affect me getting a raise or a promotion.
(but it's not going on my resume, just the same)