When your day job involves trying to send 1,000,000 people to Mars, even your downtime activities skew ludicrous. SpaceX and Tesla CEO Elon Musk knows how to wring every drop of life from his days off. You may choose to fight the crowds at the beach or, let's face it, dodge the August heat altogether and binge-watch bad television shows instead, but Musk recently spent his weekend walking on the wings of a biplane.

Since the man has such a penchant for the absurd, it begs the question: what else has Elon Musk done on vacation?