The phrase comes from Clash of the Titans, most famously the 2010 remake where Zeus, played by Liam Neeson, orders the Kraken unleashed. The line was heavily featured in trailers and quickly escaped the film as a standalone meme. Online, people began pairing it with videos of pets, children, athletes and anything about to cause mayhem, turning a mythological sea monster into shorthand for unleashing something wild. Its brevity and booming delivery have kept it in soundboards and edits long after the film left cinemas.