In a famous story from Douglas Adams' book So Long, and Thanks for All the Fish , the protagonist Arthur recounts a time he sat down at a table to enjoy a coffee, newspaper, and packet of biscuits he'd recently purchased at a shop. To his horror, a man sitting across from him grabbed the packet of biscuits, tore it open, and started eating them. Instead of saying anything, Arthur passive-aggressively reached into the packet and took what was rightfully his, hoping the man would get the message.…