Someone shaved an arrow onto my horse's neck once ~ they'd caught him, removed his neck rugs, shaved the arrow onto him, and then put his rugs back on and put him back in the paddock.  I about had a coronary, because my mother (a vet) had had a series of cases that week of pets which had been shot with a bow and arrow.  Months later, a friend of mine confessed that she'd done it, and hadn't told me because she saw how much it upset me.  Instead, evidently, it was preferable to leave me panicking, thinking my horse was marked for some horrible fate.. People suck.