Pfeifen im Walde
Translated word for word, "pfeifen im Walde" means whistling in the forest. The English phrase "whistling in the dark" is not so different. Both mean to try and stay brave or convince yourself that everything is alright in a bad situation. The forest is often presented as mysterious, concealing something sinister, for example, in fairytales like "Hansel and Gretel" recorded by the Brothers Grimm.