Håkan wants his parents to go back to the birthing center and replace her with a baby that does not cry so loud.

Sune also holds his first party, with "loud" music, "cute" girls, dancing and playing Post Office.

The Andersson family also attend an entertainment evening, which end up embarrassing for Rudolf as Håkan and Sune take him to the stage.

With the secret revealed, Sune and Joakim think the tree house is no longer fun.

But Håkan replies that if they do not let him into the game, he will reveal that Sune and Joakim have a pin-up girl picture.

But when Sune, who will leave the 2nd grade for the 3rd, is about to sing Idas sommarvisa he cannot recall what blossoms (which is the flowers, in Swedish: "blommorna"), and forgetting the song lyrics, he sings "Jag gör så att koskiten blommar" ("I make the cowdung blossom").

Audio recordings were released to cassette tape in 1989 Änglatroll entitled "Sunes första party".