I hear that dragon coasters give your coffee table a +3 bonus verses Diet Coke. I hope I never find out because I don't want to be found anywhere near a Diet drink of any kind. Reminds me of a game we used to play (Wil played in it occasionally, too) where we used "light beer" as a faux-"Detect Evil" at taverns. We'd look around and if we saw people drinking light beer, we'd just attack them on site.