A man who stabbed two men after one of their friends accidentally threw a lollipop stick at a BMW has been jailed indefinitely for public protection.
Darius Antoine, 23, from Hackney, stabbed a City banker and a diplomat in a "shocking and violent" attack, Southwark Crown Court heard.
The attack happened outside a London Soho nightclub on 6 December 2009.
Antoine was told he must serve a minimum of six years before being considered for release.
The judge said he found Antoine, of Haggerston Road, Hackney, east London, posed a significant risk of further serious harm to the public.
Antoine stabbed Ben McKinney and Brian Dorsett "for no reason whatsoever" in a "wholly unjustified" attack outside the Moonlighting nightclub in Greek Street, Soho, Recorder William Boyce QC told the court.
The victims, who had earlier attended a black tie gala ball, were flown to the Royal London Hospital by helicopter, suffering serious chest wounds.
Mr McKinney was able to take down the BMW's registration number despite having been stabbed and Antoine was later arrested.
Antoine was "carrying the knife to use as and when the occasion arose", the judge said.
"For no reason whatsoever he stabbed two men, one of whom was utterly helpless, and yet he still came back for more," the judge said.
After leaving the Moonlighting club at about 0500 BST, investment banker Adlai Kerr threw a lollipop stick into the road, accidentally hitting the rear windscreen of a white BMW but leaving no marks.
Antoine got out of the car and demanded an apology.
He the went back to the car to get the knife and returned to stab banker Mr McKinney, the court heard.
Antoine then went back to the car again but then returned to stab diplomat Mr Dorsett in the chest, causing him life-threatening injuries.
The judge said it was "a lottery" whether the victims suffered fatal injuries or not adding that Antoine was lucky that both men made full recoveries.