This is why we can't have nice things.

Thousands of people descended on Sydney's Coogee Beach, in Australia, on Christmas Day for a massive DIY party. And boy, did they cause a mighty ruckus.

People climbed on roofs of nearby businesses and lifeguards were forced to sound the "shark alarm" three times, to get drunken revellers out of the water.

But what has especially angered locals was that they forgot to clean up after themselves.

15 tonnes of garbage was left on the beach, according to Randwick Council who labelled the event "disgraceful."

The council also said there was also "a spate of alcohol-induced incidents from backpacker revellers."

The result? Alcohol will be banned from the beach until the end of summer from Thursday, following public outrage at the state of the beach following the gathering.

Coogee beach, Australia at 11pm last night, Christmas night. What an absolute disgrace by tourists who are guests in our beautiful country! pic.twitter.com/mhK6KSFlqF — Martin Walsh (@martinwalsh) December 26, 2016

It was only a few weeks ago that alcohol consumption on the beach was restricted between the hours of 12:00 p.m. to 4:00 p.m. by the council, in order to reduce alcohol-related incidents.

"However, the poor and inappropriate behaviour of a few on Christmas Day have forced Council to introduce a total alcohol ban for the area for summer," Mayor of Randwick, Noel D'Souza, said in a statement online.

"The public outrage to the devastation of the parks and beach itself on Christmas Day has been quite phenomenal. The clear message we've received is that we need to give the beach and nearby parks back to all people to enjoy peacefully and safely."

Before and after backpacker Christmas on Coogee beach. pic.twitter.com/IKxmhpell4 — Brianna Parkins (@parkinsbrea) December 25, 2016

While there were three arrests, police said they were "generally pleased" by the behaviour of the revellers, according to the Daily Telegraph.