Age Hareide's side immediately went on the attack down the right, winning a throw in for resident Rory Delap wannabee Henrik Dalsgaard to launch into the mixer.
The Brentford full-back did exactly that, flinging the ball with all his might into the heart of the Croatia box.
After a moment of indecision, it dropped to Jorgensen at the far post, with the centre-back taking a touch before somehow squeezing an effort below Danijel Subasic and in off the post to give the Danes a shock lead.
'Janka' was mobbed by his team-mates in the wake of the goal, with neither the defneder or his fellow countrymen able to believe their start.