Day 21: First time you sold some of your D&D books.
Well...I've never sold D&D books. Ever! I've sold lots of books from other RPG systems, but never D&D books. Just never had the desire to do so. I can't even part ways with my 3rd Edition core books, despite the fact that I will probably never play it again.
I've only ever "lost" D&D books over the years. As our old group split up, some of our books just went to different people in the group. AND, much to our eternal unhappiness, one of our friends went "hard-core Christian" and somehow "disposed" of a huge bulk of our D&D stuff! Ugh. I hate to think about it even to this day. It was like our own personal RPG Inquisition! I forgave him long ago, but the pain lingers on...
Wait! Maybe that trauma is what keeps me from getting rid of D&D books!
I think I just had a breakthrough!
P.S. Despite the fact that I used the image above that depicts a book burning, I don't think the guy burned our books. I think he just threw them in the trash. Just as bad, though, in the end.