Porto. “Once Bitten, Twice Shy” by Joseph LeDoux, The Amygdaloids, and the album “Anxious” (2015), is the official song of the 2nd World Congress on Facial Expression of Emotion (2ndWCFEE 2018), to be held in Porto (Portugal), on October 11-13, 2018. “It’s a love song about Pavlovian conditioning,” said Prof. Joseph LeDoux to Prof. Freitas-Magalhães.