Mates Jimi Hunt and Dan Drupstee dug the 650m slippery slide on a property at Helensville, northwest of Auckland and opened it this weekend as part of a festival to help combat depression.

Denmark's Katrine Veje, left, is comforted by Australia's Charlotte Grant, right, after the Women's World Cup round of 16 soccer match between Australia and Denmark at Stadium Australia in Sydney, Australia, Monday, August 7, 2023. (Photo by Rick Rycroft/AP Photo)

LGBT activists take part in a “Rave Pride” demanding state support for the local LGBTQ outside Ukrainian President's office in Kyiv, Ukraine on July 30, 2021. (Photo by Gleb Garanich/Reuters)

Boxers Deontay Wilder, left, and Tyson Fury exchange words as they face each other at a news conference in Los Angeles, Wednesday, November 28, 2018. The pair are slated to fight Saturday night for Wilder's WBC heavyweight title. (Photo by Andrew Couldridge/Action Images via Reuters)

A boy looks on as fire fighters try to extinguish the fire at oil wells, were set on fire by Daesh terrorists as they fled after Al Qayyarah town's cleansing from Daesh militants as the operation to retake Iraq's Mosul from Daesh continues, in Al Qayyarah Town of Mosul, Nineveh, Iraq on November 02, 2016. (Photo by Yunus Keles/Anadolu Agency/Getty Images)

Argentina's Clara Baiocchi pats Puerto Rico's Alondra Negron as she falls during the women's 3000-meters steeplechase final at the Pan American Games in Santiago, Chile, Saturday, November 4, 2023. (Photo by Fernando Vergara/AP Photo)

People watch waves crash over the sea wall in Revere, Massachusetts on January 13, 2024. The Massachusetts Emergency Management Agency is reminding residents of the possibility of flooding in low-lying areas and streets as a third storm in a week batters the state. (Photo by Joseph Prezioso/AFP Photo)

If we were to burn NH4Cr2O7 with HgSCN in the Dark Ages in Europe and show it to anyone, it is us who would be burning next on a fiery cross of Inquisition. And it’s no wonder, since this experiment produces a truly marvelous result. At first, as you ignite the mixture of NH4Cr2O7 and HgSCN, all you can see is that it is slowly burning with a reddish flame. After a while, however, a crater is formed in the middle of the burning pile, and then, suddenly, tentacle-like appendages start sprouting from the burning mixture. And you can almost hear the scream of the mad occultist – “Come forth, Kraken! Come forth!” But of course, this is simply a chemical reaction that is called the "Pharoah's Serpent". It was also often sold in firework stores until people realized that it was toxic.