Popsugar Culture Harry Potter Best Harry Potter Theories 10 Harry Potter Theories You Won't Be Able to Wrap Your Head Around June 8, 2018 by Ann-Marie Alcántara View On One Page Photo 3 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 Dumbledore is death. This theory is one of J.K. Rowling's favorites and is simple: Professor Dumbledore is death, which makes sense considering he greets Harry at King's Cross in the last book. Previous Next Start Slideshow