Overview: Nesrin and Annika enjoy "prank" holidays until Joel shows them rule 23 from the regulations: There is no such thing as a prank-free time. Nesrin begins to suspect. Casper is jealous that Mikka and Reena get along so well and straddle in between. Julia is desperate: For lack of alternatives, Noah plays the main role in his film himself and that doesn't work. Do they have to write off the film before it's shot?