Here is my favorite doubled die, and it's on a Peace Dollar. http://ec2-13-58-222-16.us-east-2.compute.amazonaws.com/wiki/1934-D_VAM-3
What happen there was, the Eagle tryed to fly off with the Doubled Die . But instead, it took the spear . Just like the Doubled Ear, Lincoln talked to much in school and was always getting his Ear pulled ..
And this is why newbies (and some experienced collectors) are confused about what a doubled-die struck coin is. I have seen RPMs and scratched dies posted. I guess it creates job security.