A dispute between two rival ice cream sellers which was caught on film is being investigated by police.
The film shows a fracas between Mr Yummy, run by Zeheer Ramzan, and Mr Whippy, run by Mohammed Mulla, on Palatine Road, Blackburn on 2 June.
Mr Ramzan is apparently seen breaking a window in Mr Mulla's van who then drives into the back Mr Ramzan's van.
Eyewitness Mobeen Yaseen, who filmed the fracas, said he could not believe what happened.
"I heard all this commotion and swearing and thought I'd film it," said Mr Yaseen, 33, who lives on the street.
"My neighbour told me his daughter who is 12 or 13 was being served just before I started filming it when another ice cream seller started shouting he could do the same ice cream 10p cheaper and the other one got annoyed and then it turned into fracas.
"This is a really friendly and peaceful street and it's not acceptable.
"I am just glad my sons were out at the time. I am very strict with them and that is certainly not the language you expect from ice cream vans."
Mr Ramzan, from Halifax, has declined to comment.
But Mr Mulla, from Blackburn, said he was blocked in, suffered a panic attack and did not intend to drive into Mr Ramzan's van.
The film has attracted more than 400,000 views on YouTube .
Blackburn with Darwen Council, which issues licences for street trading, confirmed it was investigating the incident.