Karateka vs. professional fighter using a stick: A theory that it would be a close match if the rule allowed the karateka to kick the tool once. ◆The pattern of a child hiding a stray pet from their parents: A theory that it could go up to a maximum of one person. ◆Heavy smokers over 100 years old: A theory that they don't exist. ◆Nobody says "hello" to their friends: A theory that no one does.