Park Street in Bristol has been transformed into an enormous water slide, and a huge crowd turned out to watch hundreds of lucky people slide down it in the sunshine.
The slide was made of hay bales, covered in plastic sheets, with lots of water, and washing up liquid poured on top to help it become slippery.
360 people were selected from 100,000 applicants and began riding the slide from 11 am this morning. Among those was ITV News weatherman Alex Beresford, who went head-first down the 90 metre slide dressed as a penguin.
Organiser Luke Jerram told the BBC: