The McDonald’s Szechuan sauce, a teriyaki-like dipping sauce that was released in 1998 in promotion with the movie ‘Mulan’, is a prime — if not THE prime — example of just that. Featured on an episode of popular adult cartoon ‘Rick and Morty’ in 2017, the once sought-after sauce surged in demand and hype, eventually leading to McDonald’s releasing batches of the condiment in limited amounts last October.