Okay, bear with me, this is a WILD one.
Snow Crash begins with the story of how our hero and protagonist Hiroaki Protagonist loses his job as a deliverator for the Nova Sicilia franchulate when he misjudges a shortcut through another franchulate (a franchised nation-state within the now-gone US) and only does not have to Very Finally Answer to Uncle Enzo, head of the Mafia franchising both Nova Silicia and the pizza delivery service in the country, because the other protagonist, a teenaged skateboard kourier by the nom-de-guerre of Y.T., takes over the last leg of the delivery, earning her A Certain Standing within the Mafia.

The worldbuilding only goes harder from thereon in, including a full-blown goggle-accessible Metaverse and a plot that moves into literally infectious thoughts and (presumably) heavily fictionalized Sumerian Cosmology.