n. A usually innocent or normal occurrence or action that results in terrible consequences. Usually having to do with being physically hurt or verbally abused.
Contemporary Example: Bob smoked a cigarette on the corner and threw it into a trash can and walked away. The next morning he returned for another smoke to find the building on the corner had burned down. His Cigarette caused an orphanage to burn down. His smoke was Hitler Cuckoo.
Classic Example: Romeo and Juliet, and love that ends up causing the deaths of many people. Some loves are Hitler Cuckoo.