If someone says: That's impossible. You should understand it as: According to my very limited experience and narrow understanding of reality, that's very unlikely.
S. Horiuchi, K. Kobayashi, R. Kumai, N. Minami, F. Kagawa and Y. Tokura, "Quantum ferroelectricity in charge-transfer complex crystals", Nature Communications 6, 7469 (2015).