I've had a few:
Most recently, this past summer was fishing a small lake out in the middle of nowhere and I fished until after dark. After loading my boat, I pulled ahead into the small clearing in the woods that acts as an unlit makeshift parking lot instead of staying right by the water like I normally do when I fish there. I left my Jeep lights on so I could see what I was doing while I was putting my stuff away and I was almost done when I heard a noise. It didn't register right away, but after a few seconds it hit me. It was a deep low growl that made the hair on the back of my neck stand up! Needless to say, I hopped in my Jeep and got out of there and finished putting my gear away when I got home. I also did a little research online and I'm about 99.9% sure the growl came from a wolf.
While prefishing for a tournament last year a storm was blowing in, and was quite a ways out. We had been tracking it on my dad’s Humminbird and it looked like it was going to miss the lake. The storm was quite a ways out too so we decided to fish a little bit longer. About 15 minutes later, we started noticing if you were to lift your rod tip anywhere above your head you’d hear these little snaps and could even feel it in your rod a little. Needless to say, it was a little unnerving to say the least.
The other one that comes from fairly recent memory was a time I went out knowingly before a storm on the lake we live on. I knew I had limited time but I thought I’d have at least an hour if not longer. However, I was wrong. I no more than got to my spot and started fishing (caught one right away too), and I saw a flash of lightning and heard the thunder, so I turned and headed for home. About halfway between me and our house there was a pontoon that had their motor cover off. I stopped to check on them and they had gotten lost and on top of that their motor wouldn’t start. I sat there hanging onto their pontoon while I helped them get the motor started with lightning flashing all over and in a downpour. Probably not the smartest thing I’ve ever done, but I was blessed that someone up above was protecting me that day.