back in 2011 you posted that hens getting scared could cause an egg to have blood .. you were promptly scolded by a few that its bogus. well you were correct. i just looked it up for a friend and the Scientific chicken industry magazine 5m the poultry site had this ;
Frights and disturbances Take care that birds are not disturbed by unusual or sudden loud sounds in the layer shed. Was causes of blood in eggs.