The Lightbulb joke is an ancient, time-honored method of communication relying on one basic principle: One assumes that there is a lightbulb somewhere that is dead. One asks to their companion how many people of a certain group would it take to change it, and the second party answers as best they can off the top of their head. Over time, it has been found in philosophical texts, political debates, religious sermons, blogs and tabloids. The first recorded instance of a lightbulb joke is found in the Bible, in the book of Genesis, chapter 18, verses 20-24: