The Flood, a disgusting enemy in Halo, was partly inspired by a children's book.Halo 2 designers, Lorraine and Robert McLees, created various things for the game beyond their job description.The inspiration for the Flood's infection form came from a palm tree in 'The Saggy Baggy Elephant' book.Crunch, the demanding work culture, was experienced by Bungie devs during Halo 2's development.