I haven't really done anything I feel guilty about. I don't feel bad for killing my enemies in games, and I'm rarely a prick to people who aren't my enemies unless they deserve it. The closest thing I can think of would've been a time in vanilla when I was helping a couple guild members of mine. We were all warlocks and they didn't have the gold or group for the items necessary to get the mount, and I'd already done it and had the items. They weren't very bright, and I convinced them that the most fair way was if I'd let them use my items if they each paid me half of what they're worth, so that we'd each have only paid half. They didn't ever catch on that I made all my gold back with that exchange, so it wasn't an even split at all. But I don't feel bad for it, since I still helped them a lot and did the dungeons again when I didn't have to. I guess I've also gotten too close with a girl that I really shouldn't have through the game, but that wasn't really game related so it doesn't count.