Two offenders stole expensive trainers off of the boy.
Police say two offenders punched the 16-year-old, and threatened to stab him, near Bicester Village on May 14th.
They're now appealing for witnesses and say it happened 'at a busy time of day,'
The teenager was approached by two men who attempted to grab his shopping bag at around 6:30pm, on the side of the A41.
During the struggle, one of the offenders punched the victim in the face and the other offender pulled a knife out and threatened to stab him if he didn't hand over the bag.
He suffered some bruising to his face.
The pair then ran to a black Vauxhall car which was waiting in the Burger King car park and drove away, heading southbound on the A41.
The first offender is described as a black man, around 6ft 2ins, aged in his late teens and slim. He was wearing a blue Nike tracksuit, a thin black puffa jacket and had his hood up during the incident.
The second offender is described as a mixed race man, around 5ft 7ins, also aged in his late teens, with black, fluffy hair, a small amount of facial hair and of large build. He was wearing a beige Nike tracksuit.
Investigating officer, Nicola Manze from Banbury police station said: “This was an extremely distressing experience for the victim.
“This incident took place on the side of the road during a busy time of day where the traffic passing would have been heavy. Additionally, I believe there may be a number of people who were at Burger King at the time and may have seen something.
"I would particularly like to hear from a gentleman who stopped to see if the victim and the friend he was with were alright, but was unable to stay to provide any details to police.
“I urge anyone who has any information, no matter how insignificant you think it may be, to get in touch. If you have dash-cam footage from the time of the incident, please review it."
You can contact Thames Valley Police online or by calling 101, quoting reference number 43190144725.