Here's my story:
I was introduced to D&D (the blue box) by my "Big Brother" (from the Big Brothers/Big Sisters organization). Both my sister and I saw that this was a fun game, so we asked our mom if she would buy it for us. She made some comment about "Oh, I hoped you'd never ask to play D&D..." since she was the sort of person to believe *anything* especially if it was on TV. But nonetheless, she did buy me/us (my sister quickly lost interest) basic D&D, and then each of the hardback 1st edition books. In fact, for one birthday party, I even got her to decorate the top of the cake with a beholder, with gumdrops at the ends of each eyestalk. (She gave the beholder thirteen eyestalks

but it was otherwise pretty cool.)
And then, she fell in with those religious nuts. She was a generally depressed person, and as so many desparate people do, she tossed away logic and went for its more comforting opposite.
She became close friends with a new priest at the church. This particular priest had 3 children who also had some interest in D&D; they were a bit younger than I was, so they weren't exactly gaming buddies, but we at least had something in common. Imagine my surprise when I went over to their house and looked at theird D&D books, only to find them censored! One of the parents had taken a marker and marked out everything that related to clerics worshipping gods and everything related to demons, devils, etc (The "D" section of the Monster Manual was quite a sight to see.). The kids could play D&D as long as they didn't use any of the "bad" parts.
And then they effectively had an intervention for me. They started telling me all the reasons why these elements of D&D were bad. I countered their arguments, but they were only in a mood for a lecture, not a discussion. In the end, I was banned from playing D&D. I sarcastically asked if we should organize a book burning for my books; they laughed at how people would react, but seemed to like the idea (just not the publicity it would draw).
So I got to keep my books. And since my mom was never around when I played D&D anyway, I just kept playing. When we moved to Connecticut for a year so that she could be closer to a large community of those religious nutsos (one family of them featured a gay man who had been "cured" and now had children), the friends I played with tended to play somewhat informally, since we only met during school, so we'd play an "oral" rules-loose mostly-diceless version of D&D. And then we'd play over the phone, and I don't think my mom ever knew just why I liked to talk to my friends for such long periods of time over the phone.
Later on, when I was at college, there were so many other games to play (Paranoia, Call of Cthulhu, Marvel Superheroes RPG, DC Heroes RPG, Palladium, etc), that I didn't play much D&D... but we did play *some* D&D, so I would lie about it (or at least selectively not mention it).
And then she died, and everything was fine again.