I'm always non-fannish at work because you just never know who it's safe to talk to and who is gonna give you judgemental looks. If they don't know you're a safe person to be fannish with then you could let them know that you are & hopefully you'll be included in the next fannish conversation :) (In a hypothetical situation where the conversation is still ongoing, I would probably pop my head up and be all "oh I couldn't help overhearing, I love [x] thing too!" and try and join in.)
It depends on the co-worker and the fandom. I tend to not admit I know as much about a fannish thing as I do - like when people are talking about Star Wars I chime in, but in a generic sort of way.
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(In a hypothetical situation where the conversation is still ongoing, I would probably pop my head up and be all "oh I couldn't help overhearing, I love [x] thing too!" and try and join in.)
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