Jukka throws a water bottle to make the sauna stones hiss
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Jukka fills a water bottle with water, and throws it at the stove with the cap off, making the stove hiss on his first attempt.
He makes several attempts from longer distances, and misses all but one of them.
His final and longest successful attempt is measured at 37 metres and 10 centimetres.
(Written by TRoosevelt1776 and proofread by Karl Craven)