Now imagine the Nordics having a prank war

Denmark: spreads thousands of legos on the stairs up to the first floor of the house

Sweden: making all furnitures made in IKEA, and probably scare you from turning off the lights suddenly and making creaking noise or doors opening.

Norway: Let's his fairy friends touch you or poke you, or even you can hear them whispering behind you in a creepy way

Finland: sniping you around the house and you can't see him.

Iceland: Finding a way to make the floor filled with lava

That will be so scary and insane.