Broker K arrives to present a purchase offer to Mrs. D, an 80 year old invalid who is not always of sound mind, and finds her son and her daughter-in-law present. In the presence of Broker K, both individuals persistently urge D to accept the offer, even though it is much lower than the price she has been asking for her home. If D accepts the offer, she may later claim that:

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.