A man is facing a jail term for trying to kill his friend after being accused of not waving to him from a car.
John McCoo, 33, admitted attempting to murder Brian Winters, 38, by stabbing him on the neck and body in Albert Road, Crosshill, Glasgow, in July.
The High Court in Glasgow heard how the attack perforated Mr Winters' external jugular vein.
Judge Lord Pentland called for background reports on McCoo and deferred sentence until next year.
The court heard how Mr Winters and his girlfriend were out walking their dog when McCoo drove past in the passenger seat of a car and did not acknowledge them.
Mr Winters was angry and phoned another friend Des Haggerty, 34, who was driving the car to complain.
Minutes later the car driven by Mr Haggerty stopped in the street near Mr Winters and McCoo got out.
He produced a knife and struck Mr Winters on the neck then stabbed him on the left side of his body before returning to the car and being driven off.
Lord Pentland said: "The accused has a troubled record and in view of the escalation I am calling for background reports and a risk assessment."
Sentence was deferred until next year at the High Court in Edinburgh.