As the world's greatest athletes descend upon Rio for the Games of the XXXI Olympiad, you'll have countless events to watch. But which of those events is the best? Mark and Hal get to the bottom of the debate as they move with the swiftness of Usain Bolt, the grace of Gabby Douglas, and the precision of whatever Dressage horse won gold in Beijing.

See Hal live in Hollywood on 8/5 for his monthly show Headcan(n)on with Joseph Scrimshaw! Get tickets here.