Stunning investors, Tesla CEO Elon Musk was filmed smoking pot and wielding a sword on a webcast.
It came just hours before the automaker said its recently-appointed accounting chief would leave.
Reuters reports it's the latest in a string of unusual behavior and executive departures.
Shares of the electric carmaker tumbled more than 6% on Friday to $263.24.
Investors have been on edge after Musk proposed and then abruptly pulled the plug on a go-private deal.