Terrified Simon Chinery, 28, was covered in blood as the masked attacker sliced his right hand “down to the bone” with a 10in blade.
The father-of-one was walking away from a service station cash point when the sinister clown crept up behind him.
The young joiner grabbed the knife to stop the clown doing any serious harm to his body – but says his fingers “exploded” following the altercation.
He was taken to hospital for doctors to try and repair the damage – but Simon says he is now classed as disabled and has been forced to give up his job.
Simon, of Blackburn, Lancashire, said: “I had never been so petrified in all my life.