Lucy calls the President to tell him about the replica of the White House made of sugar cubes built by the boys' Cub Scot troop. She actually gets Mr. Kennedy on the phone and receives an invitation to present it in person. On the train to Washington, the model is destroyed, forcing Lucy and Viv to do a quick rebuild. To get enough sugar cubes, Lucy hops off at one stop and cleans out a nearby diner's supply. (thetvdb.com)