Oath
Explanation
The Joke
A courtroom scene unfolds in which a lawyer addresses the judge: "Your honor, is it true that in this country you can swear an oath on any book?" The judge confirms: "That's right. It doesn't need to be a Bible. It can be a novel, a legal document, a work of fiction." The lawyer, looking satisfied, responds: "Thank goodness we live in a free country." The lawyer then turns to the jury and says: "I ask the jury to strongly consider the death penalty." A book is shown at the bottom titled "How to Lie Under Oath, Right Now, Using This Book in Particular."
The comic takes the real-world legal accommodation that allows people to swear their oath of truthfulness on any book (not just a Bible) and pushes it to an absurd extreme. Someone has written a book that is literally an instructional guide for lying under oath, and by swearing on it, they are paradoxically fulfilling the oath requirement while simultaneously undermining the entire purpose of the oath.
The Humor
The humor operates on multiple levels. There is the logical paradox of an oath of truthfulness sworn on a book that instructs you to lie -- it is a self-defeating ritual. The lawyer's reaction, asking for the death penalty, suggests that the court views this as such an egregious violation of the spirit of the law that it warrants the harshest punishment. The joke also satirizes the sometimes hollow formality of courtroom oaths, suggesting that the ritual of swearing on a book is more about tradition than actual truth-enforcement.