Teenage gatecrashers have trashed a $2m house in Britain after a Facebook-invite party got out of control and hundreds of revellers crammed into the exclusive residence and spilled out on the street.
The last thing Catherine Seale told her 17-year-old son Christopher before she went on holidays was, "don't have any parties".
But he ignored that warning and invited 60 friends to his house to celebrate his birthday.
The party got out of control after one of the friends put the details on Facebook and the gatecrashers arrived.
A security guard paid a paltry $90 to keep the party under control did a runner when hundreds of people turned up uninvited.
Riot police were called as up to 600 people descended on the home.
When the 'party' was over the damage bill was around $25,000 and there was vomit all over the terraced property in Highgate, North London.
Mrs Seale told the Daily Mail: "All parents should be warned that this could happen if you go away and leave your 17-year-old alone.
"I think if anyone is going to throw a party, they need to look at their privacy settings on Facebook. It’s absolutely essential that children are made aware of this."
One girl at the party was taken to hospital with alcohol poisoning.
The Mail reports that laughing gas canisters were thrown across the living room carpet, cushions, sofas and carpet were stained with blood and vomit and some rooms were marked with graffiti. Despite the efforts of the children to clean up, the house smelled of vomit and alcohol for days.
"The last thing I told him before I went away was 'don’t have any parties'. The carpet was trashed and they damaged a skylight because somebody fell on it," Mrs Seale said.
"They could have been killed. Even though it had been cleaned up when I got back from France, everything felt sticky and dirty and it stunk."
"The fact there was a 16-year-old girl already passed out with alcohol poisoning suggest things could have got very much worse, very quickly.
"It doesn’t seem to have done his kudos at school any harm though. Apparently he has even got a girlfriend out of it. I think his reputation has shot up because of it, which isn't very good for us parents."
A neighbour told the Mail there were hundreds of teenagers in the street.
A furious Mrs Seale has forced her son to hand over his savings, work for a local charity and apologise to neighbours as punishment.