Steinar blows up a cement mixer
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Steinar places Valdemar on the side of a cement mixer, and then starts a fire inside of the mixer, before dropping in an aerosol can. Nothing happens for a long period of time but, with less than a minute left, the can finally explodes inside the mixer, making a very loud noise which earns him first place.
(Written by Will G and proofread by Karl Craven)