I've got 2 that come especially to mind. One was when I was relatively young. 19 or 20, away at college. Really my first time hunting deer "on my own," away from the party of family and friends that had driven and posted the same central MN brushlands since prohibition. I was trying out some of those fancy hunting techniques I had read about, like stalking and still hunting. I was young and dumb, so I was covering lots of territory on the fringe of the Boundary Waters. My plan this particular day, was to follow a high, rocky ridge about 2 miles to a power line, then the power line the remaining 1.5 miles to the road where a buddy would pick me up after sunset. While approaching the road, still (barely) in legal shooting hours, I saw a decent buck standing in the open, looking away! Distance was about 300 yards, and a dogleg in the power line right there made for a safe shot, not towards the road. It was a poke for my .308, but with a solid rest over the power pole cribbing, I felt confident and squeezed off a shot. The deer just stood there, so I bolted in another round, held slightly higher and fired again. At the second shot, I heard a shout and spotted a game warden waiving a blaze orange glove frantically and yelling "cease fire" at the edge of the power line. I had put 2 rounds through their mechanized decoy placed to catch road shooters. They never suspected anyone would cover several miles of broken terrain and approach from the back side of their post to shoot their decoy!
The second was on public land across from my Sister's house. About a half mile walk into the land from her back door. She had a cat. The half hour before shooting hours, I kept thinking I heard a cat meowing in the woods. Sure enough, at a half hour before sunrise, here comes Sarah, strolling up to my tree stump and mewing a happy greeting. Was alright for awhile, until the squirrels woke up. Every time some leaves crunched, she'd slink off to stalk one, then howl angrily when they went up a tree. Apparently she hated deer, as when a fawn showed up, she raced off hissing and yowling to challenge the deer and chase it off. I just packed up my stuff and headed back, cat following at my side like a faithful dog. On future hunts, I made sure the cat was locked up before heading into the woods.