Some of my most memorable:
About 20 years ago, I was squirrel hunting on some family land. I was sitting on a stump and had 4 or 5 bushy tails laid out on a downed log next to me, within an arms length. I was quietly sitting there, and heard a noise right behind me. The next thing I knew, a big red tailed hawk was making off with two of my squirrels. His wing actually knocked my hat off.
Later that fall, in a nearby spot I was sitting in a deer stand. A huge flock of grackles (a black bird) came in, landing all around me. They were on practically every limb around me, some within a couple of feet of me. Every few seconds or so, they'd all leave in unison, fly around in unison, and come right back. I immediately noticed a bright green bird, flying around with them. It was a parrot. I guess someone's pet got loose.
When I lived in Alaska, I was on a moose hunt in Southeast Alaska, near St. James Bay. I was taking a nap under a big spruce tree, an was awakened by a big tug on my foot. I sat up and was face to face with a young black bear. The eyes about bugged out of his head, and I'm sure mine did to. Fortunately, he hightailed it out of there. Earlier, I had been poking a dead salmon with the toe of my boot, and I think he thought I must have been something good to eat.
Earlier this season, on a particularly warm day, I was sitting in a ground blind hoping to get a shot on a whitetail. I heard some scratching and rustling behind me and assumed it was a rodent of some sort. A few seconds later, I saw some movement out of the corner of my eye about a foot from my head. It was a huge black rat snake. He had to have been at least 5 feet long. He stretched himself out on one of the limbs I had made my blind out of and licked (smelled) my bow as he crawled past. I let him sun himself for a little while, but when I moved to stretch myself, he crawled off.
Last season, I had a grey fox jump over my feet after I blew a little squeaker call. He didn't hang around long.