Police are searching for an elderly couple after a man was seen to jump in front of their car before opening a rear door and climbing in.
The incident, which police are treating as suspicious, happened at about 1830 BST on Wednesday in Dundee.
A witness reported that the man jumped into the car at the junction of the city's Lochee Road with Tullideph Road.
The car, an older style maroon Volvo, continued up the road in the direction of Lochee.
The man who got into the car was seen with a second man shortly before the incident.
Tayside Police said they wanted to trace the couple to ensure they were safe and well.
A spokeswoman said: ''At this time there is no evidence to suggest that any 'carjacking' has taken place. We have had no reports of stolen cars, missing persons, or any abandoned vehicles found.
''However, we are keen for the elderly couple seen driving the maroon-coloured older style Volvo to get in touch with us. We need to make sure that they are safe and well and that nothing untoward has happened to them."
She said officers were reviewing CCTV footage in a bid to identify the couple and the men involved.
The man who climbed into the car is described as being his early 20s, about 5ft 6in tall, of scrawny build and with short dark hair.
He was wearing white trainers, tan or light-coloured tracksuit bottoms and a dark-coloured tracksuit top, possibly blue.
The other man is described as being in his late 20s, of large build and almost bald. He was wearing a white tracksuit top with blue markings on it and white tracksuit bottoms.
Before the incident, both men are believed to have been standing in the middle of the carriageway for some time, causing other motorists to take evasive action.
Police said they wanted to speak to anyone who may have information about the men or the couple.