Björn Skifs is a singer, songwriter, actor, and screenwriter but in this ad, he's the guy who just wants to eat chips for dinner. He keeps repeating the brand name "Estrella" until the punchline, when she asks "so you haven't done the potatos?" He replies "No, I've done Estrella" which is a bit of a sexual innuendo suggesting he's been with a girl by that name. Hence the slap.
"Så du har inte satt på potatisen?"
"Nej, jag har satt på Estrella!"
Client: Estrella
Principal talent: Björn Skifs