Horned Lizard
Horned lizards aren’t satisfied with just stopping predators from eating them, oh no, they want to scare the shit out of them while they’re doing it. When all else fails horned lizards constrict a muscle near a major vein that cuts off blood flow to the heart and redirects it all to the head, eventually causing blood to squirt out of their eyes. In a weird turn of events this is the same tactic horned lizards use to get dirt out of their eyes. Ever heard of Visine, guys?
Source: http://www.bbc.com/earth/story/20151105-if-it-has-to-a-horned-lizard-can-shoot-blood-from-its-eyes