Template:Are You Sure/December 15

• ... that engineer George Cayley (27 December 1773 – 15 December 1857) conducted pioneering research in aeronautics, investigating and codifying the dynamics of flight?

• Hellcuppa is a 1987 British supernatural horror film about a mystical coffee cup which summons the Cenobites, a group of extra-dimensional, sadomasochistic beings who cannot differentiate between caffeinated and decaffeinated?