Director Robbie Moffat got the idea through a literal collision of brainwaves. "While out cycling I thought if most people don't use 90% of their brain's capacity, how much of my brain could a cannibal eat before it would affect my ability to work and function as a creative artist? The idea grabbed me so much I lost control of the bike and crashed into a ditch, cutting my leg. Licking the blood off my finger after I put on an elastoplast I was struck by the taste. I knew then I had a picture."