# Testimonials. This is a form of [[Logical fallacy#Proof by authority|argumentum ab auctoritate]]. A "celebrity endorsement" is a prime example. So, too, is any speech or essay by one publicly celebrated as an athlete, actor in any form of [[theater]], or other such person, on a subject in which the author has no legitimate expertise. | # Testimonials. This is a form of [[Logical fallacy#Proof by authority|argumentum ab auctoritate]]. A "celebrity endorsement" is a prime example. So, too, is any speech or essay by one publicly celebrated as an athlete, actor in any form of [[theater]], or other such person, on a subject in which the author has no legitimate expertise. |