A Hartcliffe teenager smashed his ex-partner's car window with a machete, leaving her hurt, a court heard.
Kieran Williams thrust the blade through the passenger window of her Fiat, after he saw her driving with a man in Brislington.
Bristol Crown Court was told the passenger was unscathed but his ex-partner suffered scratches.
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The incident happened along School Road on May 29, while the vehicle was stationary.
Williams, who turned 18 the day after, pleaded guilty to making threats with a blade and to assault.
Judge James Patrick, sentencing today (Tuesday, July 20), handed him 12 months in youth detention.
He told Williams: "This was a highly dangerous thing to do.
"The incident would have left a lasting impression on them.
"It is aggravated by your shocking list of offending."
The judge told Williams, of Brocks Road, to attend Thinking Skills - a programme designed to address the reasons people offend.
The machete was confiscated and an electric bike - which Williams said was not his - was ordered to be destroyed as it was used in the commission of a crime.
Rhianna Fricker, prosecuting via video link, said Williams was seen on the electric bike in School Road around 2pm on May 29.
She described how he was seen to smash the car's passenger window with the blade and jab the weapon into the vehicle three to four times.
Police established the car registration number and located the victim, the court heard.
It transpired she sustained two scratches to her left arm in the incident.
Williams had a previous conviction for possessing a knife in public and was the subject of a Youth Rehabilitation Order at the time of the May offence.
Mandla Ndlovu, defending, said: "He is remorseful and ashamed of his actions on that day.
"He appreciates what he did was unacceptable."
Mr Ndlovu said his client had a difficult start in life but was striving for education in custody.
He the court: "He wants to apologise to his former partner."
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