Teenage friends Ellen (Yasmin Najjar), Sissi (Elsa Marjanen), Nana (Alisa Röyttä), and Eveliina (Anna Kare) are celebrating Nana’s birthday at her house. The girls start dancing in front of the window in their bras and draw the attention of some older boys who are cycling on the road. The girls try to make the boys leave but are also fascinated by the situation. Then the boys ask if they can join the party. Girl Thing (Tyttöbileet) is written and directed by Inari Niemi, and it is part of the film anthology Force of Habit (Yksittäistapaus).