During a speech he gave at a sheva brachos, Rav Shmuel Berenbaum, the Rosh Yeshiva of the Mir Yeshiva in Brooklyn, noted that he had seen a cereal box that had on its cover a picture of an athlete eating that cereal. Rav Berenbaum related that he had three questions on the advertisement. First of all, even though the athlete was holding a bowl of that cereal, who is to say that he even likes the cereal? He may detest the cereal but is being paid to pose that way. Secondly, even if he does like the cereal, who is to say that just because he likes it, I’ll like it, too? Finally, he’s famous because he can play ball well. What does that have to do with knowing if a cereal is good or not?