The Magic Words are Squeamish Ossifrage

Squeamish ossifrage is a phrase that means something like 'clearly impossible.' It comes from a story about a large bird called an 'ossifrage' that was so strong it could crush bones. In the story, the ossifrage breaks the bones of an animal and eats it, causing a squeamish reaction from the people who see it. So, when people say 'squeamish ossifrage' they mean that something is impossible to do or believe.