I have a few stories from my home course, since its 100% wooded, but I will start with this one. This was the worst experience I have ever had on a disc golf course:
I was playing with my brother and two other guys and I had shanked my second throw between the #17 fairway (the hole we were on) and the #10 basket. I put my bag down near my disc, and reach down to get the disc.
All of the sudden, my hand felt like it was on fire, and I looked down and saw something black and yellow on my hand. I first thought I had just gotten bitten by those big spiders, but then I noticed things buzzing around me. I had set my bag down on a yellow jackets nest in the ground.
I hauled ass out of there, but not before I got stung 3 more times. Then, they swarmed my bag, and we couldn't get with in 15ft of it. My brother found a very long tree branch, probably 20ft long, and hooked my bag and drug it away from the nest. We then dumped everything out and started to beat the yellow jackets that were still inside.
We finished up at 18, and sat down and talked about what just happened. They wanted to play another round, so I made 9 more holes, and I just didn't feel good after that, so I went home and recovered. I hope I never go through anything like that again.