While playing billiards, Jaap is challenged to a boxing match with a competition boxer. Siem devises a plan by which Jaap can get out of the match without losing face.
The bowling club gives its annual costume ball, where you can earn fifty bucks for the best costume. To make sure he wins, Jaap wants to rent a costume.
Jaap and Nel have a new neighbor. His name is Rafael Martinez and he is a dancer. All the women in the neighborhood love him and spoil him with snacks.
Jaap thinks he will be elected Brulboei of the Year and prepares a speech. During a Chinese dinner, to Jaap's dismay, Siem is chosen as the Brulboei of the Year.
The bowling club De Brulboeien have their annual fishing trip and this year it is again decided that the women may not come along, but until now the men have not dared to tell their wives. Jaap tries to change that.
Jaap receives a telegram. His mother-in-law is coming to stay for a few days. Jaap is completely out of control and does not hide his displeasure. The argument got so heated that he spent the night at Siem and Zus' place.
Nel's uncle is over from Australia, Jaap and Nel have to have dinner with the rest of the family. Jaap does not feel like this at all and would rather go bowling with Simon.
Jaap finally sees a chance for promotion when he is allowed to come to the home of Mr. Harmsen, his boss, to teach him billiards. Siem is also allowed to come along and then it turns out that Mr. Harmsen sees a lot of potential in Simon.
When Nel and Sister's neighbor girl is all in love she is going to the carnival and roller-skating palace in the evening, Nel has a hard time and tries to persuade Jaap to go out with her, but Jaap laughs right in her face.
When Jaap runs away from the cafe after an argument with Simon, he witnesses a bank robbery. He ends up in the line of fire, and after seeing the bullet hole in his hat, he realizes he has crawled through the eye of the needle.
Jaap receives a letter from the tax authorities, he has to come to the office the next morning. This causes him a sleepless night, did he fill in everything correctly?
It is almost Christmas and Jaap gets an offer from a con man to buy Christmas trees cheaply. Jaap and Siem spend their Christmas bonuses on them, much to the annoyance of Nel and Zus who wanted to make a Christmas dinner from it.
The bowling club has to send a delegate to Amsterdam for a meeting. The lucky one gets reimbursed for everything. The race is between Jaap and another man. Jaap loses and thinks Siem didn't vote for him.
Jaap is told by Harmsen that he must turn in his uniform the next day. He assumes he's fired and comes home like a beaten dog. Simon manages to convince him to write a letter to his boss. It turns out to be a very insulting letter.