New evidence has come to light that the old WWII ditty was correct.
The disclosure is made in a document noting a conversation in the 1960s between German war doctor Johan Jambor and his priest, Franciszek Pawlar, according to The Sun. The priest's document has come to light 23 years after Jambor's death.
Although it was known Hitler suffered a groin injury in the Somme, evidence that he was 'monorchic' - the medical word for the condition - has evaded historians. [Link]