Sister Bear is over at Lizzy Bruin's house watching <i>Trouble at Big Bear High</i>--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 <i>nobody</i>, not even adults and certainly not cubs, should use at <i>any</i> time, no matter how upset or angry they are.