To detect a bot, ask illogical questions which do not have commonly available answers from which it can source. These bots will frequently give an answer which doesn't really answer anything. > How many colors does this smell? A bot may answer this by starting a tangent on synesthesia. While technically contextually correct, it doesn't provide an accurate answer and especially doesn't respond as any human would. Never mind, most humans don't actually know about synesthesia. > Should I walk my dog with a paint brush? You get the idea.