A Norfolk man has been found guilty of stabbing a star of the MTV show Dirty Sanchez.
Mark Edward Smith, of Charles Close, Toftwood, near Dereham, had denied wounding Matthew Pritchard, 37, with intent to inflict grievous bodily harm.
But Smith, 43, was found guilty at Norwich Crown Court and remanded in custody to be sentenced on 27 August.
Smith lashed out with some car keys after Mr Pritchard, from Cardiff, pushed him out of a shop in Norwich.
Mr Pritchard, who needed 20 stitches after the attack, is one of the presenters of Dirty Sanchez. They take part in dangerous stunts on the show.
The court was told Mr Pritchard threw Smith out of the store for being abusive towards staff when he tried unsuccessfully to cash a giro cheque without identification.
Smith admitted in court that he had been "obnoxious" in the Co-Op in Toftwood.
He said: "I had recognised Mr Pritchard and thought my life was at risk after seeing what he does on TV.
"I had no intentions of hurting him."