Okay, this has to be the best TV Tropes 'explanation' for a commercial ever: "Fred's longstanding grudge against Barney, for taking reasonable quantities of Fruity Pebbles and/or Cocoa Pebbles cereal, which Fred is quite possessive of, in order to survive and thrive in the Stone Age, as part of a peacefully coexisting tribal community, has not been well documented on the show, where Fred's hard working family man personality is exemplified. "