A female driver is now warning others to be on their guard after her car was hit with an egg thrown by another motorist.
It happened on the A528 between Shrewsbury and Wem, close to the village of Myddle.
The driver, who wishes to remain anonymous, said her mother was a passenger in the car at just after 7.30pm on Saturday when an object hit the windscreen.
"At first we thought it was a stone because the noise was so loud. It all happened so quickly," said the woman, who was on her way to Cockshutt. I was with my mum and it shook us both up. This made me slow down and realised what had happened and saw it was egg.
"I looked in my mirror and the other car, which was a dark blue or black Vauxhall Corsa, had stopped to see if I was going to react to it, which I didn't. I didn't stop and carried on my journey, but it left us both very scared."
Once she got home, the woman called the police and reported the incident.
"They said people are doing this so motorists turn on their windscreen wipers and the egg will smear all over, making them get out of the car for these people to try and steal," she said.
"I have spoken about this to other people and they have heard of this happening in Telford and Tilstock near Whitchurch. If other people have been targeted they need to report it – this persons need to be caught."
Richard Ewels, spokesman for West Mercia Police, said: "We received a report at 10.36pm on November 23 of anti social behaviour in Quarry Close, Myddle. The report was of a male throwing eggs from a car at cars and people walking along the road at about 7.30pm. The car he was in was thought to be a black Vauxhall Corsa."
Anyone with information should call police on 101 or call Crimestoppers on 0800 5551111