British spies planned to feminize Hitler by sneaking estrogen into his food!

During World War II, undercover agents working for the UK were close enough to Hitler that they had access to his daily meals. The obvious thought of poisoning the Nazi leader had crossed their minds, but this would have proven impossible because of taste testers who sampled all of the Führer’s food to ensure he could safely consume it.

Therefore, they hatched a more bizarre strategy - smuggling female sex hormones into his food instead! Estrogen was an ideal alternative because it had no taste and its effects would have been too slow to have been noticed. The rebels aimed to use the hormones to give Hitler a less aggressive demeanor, more like his complaisant younger sister Paula. This plan never came to fruition, as did several other harebrained plots such as dumping glue on Nazi forces to stick to them to the ground, hiding explosives in German fruit tins, and dropping boxes of deadly snakes on enemy soldiers!
(source)