S&P 500 futures just pulled a $650 billion round trip in seven minutes — over a CEO's personal life. At 6:00 PM ET on Sunday, stock futures opened for the first time since Nvidia CEO Jensen Huang admitted to a relationship with a woman U.S. intelligence identified as a Chinese spy. By 6:01 PM ET, S&P 500 futures had erased an implied $300 billion in market cap. By 6:07 PM ET, the losses were gone — futures turned green, adding back an implied $350 billion as traders bought the dip. Nvidia's board has opened an investigation into Huang, who told the board he had been intimate with the executive. Nvidia says it has no evidence company secrets or U.S. national security were compromised. The Nasdaq 100 did the same thing — plunging roughly 400 points in minutes, then erasing the whole drop just as fast.