This happens when kids are hit with bats in their necks for weeks. When the doctors put their knives in the brains they don't fix it. Blood goes inside them.
My sister was having a baby until it was born. When it was born she hit it with a bat. This made it a leather neck.
shipwreck47" I wish I was a leatherneck, dam those guys are amazing"
girl" yeah but you are too scared to be in a real branch of service so now you are just a Navy mop handler, now swab the deck and shut up while I go off with thes leathernecks"