For the fourth season of I Kveld Med Ylvis, Ylvis got Norwegian TV personality and frequent IKMY guest Charter-Svein (real name Svein Østvik) to agree to let them play a series of pranks on him in exchange for an expensive magnetic bed, which they would give him at the end of the season.
Because Svein had given Ylvis permission to prank him, they did not hold back. Poor Svein got awakened by a train horn in his bedroom, trapped in his balcony as it filled up with plastic balls, and lured into a stunt plane, among other things.