your wife. that happened to christian bale at the academy awards. >> mostly, my wonderful wife. >> yes, rick perry, joined a club of those who suffer from brain freeze. we use our frontal lobes to sort our memories. that part of the brain is sensitive to anxiety. >> if you start to freeze you get more stressed, stress hormones go up even higher. then that shuts down the frontal lobe and disconnects it from the brain and makes it harder to retrieve the memories. >> reporter: which explains how chief justice roberts could flub the oath of office. >> i will execute the office of president to the united states faithfully. >> reporter: or george w. bush could flub this. >> fool me once -- shame on -- shame on you. fool me, can't get fooled again. >> reporter: of all the famous embarrassing cases of brain freeze, the most important example of all time is -- um, i can't remember. oops. john berman, abc news, new york.