The document discusses black swan events, which are unexpected occurrences with extreme impacts. Examples provided include the rise of the internet, 9/11, and the 2008 financial crisis. A black swan event in the housing sector could be a future recession. The COVID-19 pandemic has also acted as a black swan event, causing virus outbreaks, travel restrictions, and decreased restaurant sales. Future potential black swan events discussed include nuclear war, contact with aliens, and rising sea levels.