Apparently, post Altamont the Hell’s Angels hatched a plot to kill Mick Jagger, who apparently had the gall to be upset after they killed a guy. Sadly, they decided to go by boat rather than take their bikes.
“Gang members hatched a plan to kill Jagger at his holiday home in Long Island, New York, the BBC claims. Their attack by sea was thwarted when a storm hit their boat, throwing the men overboard .”