I was 15 and hunting with my brother in law in Utah. I had watched what I thought was a deer for hours. My brother in law would look at it through his 4x Weaver and say that it was a stump, I would look at it through the scope and couldn't decided.
Then when we decided to leave just before dark I asked him if I could shoot it. He handed me his 30-06 and I shot the stump laying a couple of dead branches down on both sides. I had to go past it on my way back to camp so I hiked over to it to find that it was a 4x4 mule deer deader than dead. That deer had watched us all day and never moved as we watched it.