A Canadian family's unfinished dream mansion was trashed by 2000 revellers after their son promoted a party on Twitter.
Some 60 police cars were called from every district of Brampton, Ontario, to quell the out-of-control party after officers discovered the gathering was promoted on social media under the hashtag #MansionParty.
But police intervention was not enough to prevent $70,000 damage being inflicted upon the mansion, which was still under construction.
Canada's CBC News website reports that several youths were arrested for assaulting police officers.
Many others were charged with underage drinking.
The New York Daily News reports that cars and a coach were lined up outside the house with revellers pushing to get into the bash.
One partygoer, Nick, 16, told the Daily News he had heard about the party on social media.
"I have seen something like this, in the movies, but never in real life," Nick said.
“There were hundreds of people here. Some people were climbing over ladders and smashing the windows. Some were drinking. Everyone wanted to get inside."