Yup, dragon tears. When I first saw Dragonshy ep, I noticed how much dragon tears were wasted. And that's a very rare alchemy ingredient. Well, if Twilight ever needed a barrel, I don't think she'd make Spike cry that much. A stylist-serpent is not as good as a real adult red dragon. And to make a big red dragon cry… Well, Fluttershy, you did the impossible.