text: The cable network 's animated show about third graders obsessed with violence and bodily emissions has replaced Beavis and Butt-head as America 's premiere gross national product ( Ken Tucker , Entertainment Weekly ) . Critics attribute the show 's cult following to the timeless power of bathroom humor and to its dark and clever plots , such as a thwarted assassination attempt on Kathie Lee Gifford .
  
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  The show 's popularity is due to the penchant people have for bathroom humor .