Elon Musk responded to a long-running fan joke that he has a World War I-era fighter pilot doppelganger

· A fan of Elon Musk's tweeted at the billionaire alerting him to a fan theory that the billionaire has a historical doppelganger called Raymond Collishaw.
· Collishaw was a distinguished Canadian fighter pilot during World War I.
· Musk jokingly replied, "full disclosure, I'm actually a 3000-year-old vampire."
· Visit...