Sister Bear is over at Lizzy Bruin's house watching Trouble at Big Bear High--a big-cubs' video that they probably shouldn't even be looking at--in which two teen bears are having an argument. When one of them gets really really angry, he says a certain word. It's a word Sister has never heard before. At dinner that night Sister tries out this brand-new, stronger-sounding word. When Mama Bear recovers her senses, she has to explain to Sister all about a certain kind of word. It's the kind of word that nobody, not even adults and certainly not cubs, should use at any time, no matter how upset or angry they are.