At the height of pre-war civilization, wedding planning companies around the world knew that repopulation of Toonatopia is is a good idea, so they used to make the Universe's most expensive stuff for a grand wedding to make sure that those couples would be future parents of the Toonatopian people that could make Toonatopia a world that also withstands nuclear blasts, meteor impacts, flash floodings or other likely disasters. They were not entirely convinced that their end was nigh, otherwise there would have been a greater demand for marriage and pregnancy. When World War X started there, couples stayed neutral for their rest of their own lives, living in very rich mansions. They can be smart and lucky enough to be inside fallout shelters or Vaults once the end comes. Long after the weddings, wedding planners had all the post-wedding plans that they would need to rebuild Toonatopia.