When Buster gets Brain's help in shopping for a hat for his Mom, he chooses to ignore his advice and finds that his Mom doesn't like the hat. Infuriated that Brain always seems to be right about everything, he soon takes to quizzing the Brain everywhere he goes, hoping to trip him up. Brain soon cottons on to what's happening, but also begins to realize what may really be troubling Buster. (thetvdb.com)