Residents of a millionaires' row have gone into battle with local skateboarders who retaliated with daily horn-blast protests outside their luxury homes.
The rich owners at the seaside strip in Swansea, south Wales, launched a legal challenge to block a new £360,000 skate park on their doorstep.
Wealthy residents in the row are going through the courts to try and halt the development.
But the youngsters, thrilled after it was given planning permission last year, are now furious at the red tape following the objections.
Hundreds of drivers have been sounding their horns at all hours as they drive past the plush seafront houses.
Seven of the neighbours begun legal action to challenge the way Swansea Council approved the skater scheme.
A campaign was then launched on social media encouraging drivers to beep their horns as they drive past the area dubbed Millionaire's row in support.
Police said it was "listening to the concerns of residents" living with the noise nuisance day and night.
The main target of the abuse is car dealer Mark Bailey because he has confronted some of the skateboarders.
Hugh Hitchcock, who is taking on the judicial review on behalf of those against the plans, hit out at the horn protest.
He said: "It is unacceptable that one of the seven applicants to this judicial review should be subjected to this appalling campaign of abuse and harassment for exercising their democratic right to challenge the unlawful decision made by Swansea council.
"We hope Swansea council will now recognise the distress and hurt that has been caused here and unreservedly condemn the despicable behaviour of those who have engaged in these actions."
Jason Williams, chair of the Mumbles Skate Park Association, said: "I saw the beep campaign last week, I'm not sure how it came about.
"We don't condone it but it's brought to the fore the strength of community feeling for the redevelopment."
The campaign hit a peak when a video emerged of Mr Bailey confronting the skateboarders.
Mr Bailey could be heard threatening to "smash in the face" of one of the skaters if he got too close to his wife while riding the ramp.
But Mr Bailey did a U-turn to withdrawn his objections to expand the skatepark after seeing the video - and suffering the car horns blaring outside his home.
Mr Bailey said: "Having taken time to reflect on the footage of the altercation that was filmed at the skate park on Wednesday evening, my wife Rhianon and I unreservedly apologise for our actions that evening.
"I will make a point of going across and personally apologising to the skaters at the appropriate time over the coming days.
"Whilst it is by no means an excuse, my family and I have been subject to significant abuse over the days leading up to the incident, culminating in objects and verbal abuse being thrown at me as I tried to drive into my home.
"This was the final straw which prompted our actions which we now bitterly regret. I do hope that those involved will accept my apology when I get to speak with them."
An online petition in support of the skatepark project has now received more than 5,700 signatures.
Local skateboarder, Arthur Gravenor, 16, said: "It's always a nice environment here.
"There are always friendly people and I feel like it's such a shame because we really want to upgrade the facilities here."
Swansea County Councillor Des Thomas, who represents the ward, said: "I think it's been a little bit childish with people beeping their horns at all hours of the day. There are elderly people there and young children nearby, so it's pointless making them suffer.
"I would appeal to both sides to just step back a little bit and understand both people's viewpoint and let the democratic process take its course."
In a statement, South Wales Police Insp Andy Harris said: "I want people living in the area to know that we are aware of recent issues, and we are looking into them."
