Not so unique...but I was amazed while hiking in thick big sagebrush a few years back to MATCH UP a set of spike antlers, especially since they were more than 50 yards apart!
All about luck...and timing. I was out in really thick PJ woodland where I'd seen two bull elk, hoping to maybe find their old sheds, or see them again. Not unique, but this 2-point (you can hang a ring on the point) at 7 " is my smallest ever! I was wondering if the mythical jackalope really do exist and I found one's shed antler!;-)