To be in over one’s head, lit. bis über den Kopf drinstecken, equiv. etwas wächst jemandem über den Kopf, fig. (English phrase) to be involved in a difficult situation that you cannot get out of
…and while I look at this picture, a German classic comes to mind: Der Zauberlehrling (The Sorcerer’s Apprentice) by Johann Wolfgang Goethe. It is about this magical broom not quite obeying the apprentice… Follow this link for this poem and its English translation.