Okay, I've got three stories that kind of had me a bit worried when they happened.
Story 1 - Roughly 35 years ago in the fall, I did a two week trip into Yellowstone. I started on the east side of Yellowstone Lake, made my way down into the Thorofare, and then exited along the South Boundary Trail to the south entrance of the park. One of my campsites was at Mariposa Lake on the Two Ocean Plateau. Back in the day there were two campsites at Mariposa: one was set in stone, and the other was an open site as long as you camped 100 feet from the lake. I think the Park Service only has one campsite at the lake these days. Anyway, I was staying at the open campsite and the other campsite at the east end of the lake was unoccupied, and in the middle of the night I could hear something outside my tent. I listened intently as it kept moving around. After what seemed like an eternity, but was probably about 10 seconds, it began to make a noise that was unfamiliar to me at the time, but have since come to know as a grizzly popping its jaws. I suspected that it might be a bear, but at the time was unsure. I'm convinced today that it was a grizzly that was curious about my tent that night.
Story 2 - As most of you know, I have a healthy infatuation with the Howard Eaton Trail.

And one October many moons ago, I started out to find and hike a section of the old trail. The section that I was interested in was the one that runs from north of Lower Geyser Basin to Gibbon Falls. This section of the trail actually is an old stagecoach road too, and it made a "U" turn above Gibbon Falls. Riders on the stagecoach would hike down from the turn to get a view of the falls. In order to find the old trail, I had to hike along the old Mesa Road before off-trailing it to find the Howard Eaton. Seemed pretty straight forward to me at the time, but what I didn't know was that there was a carcass dump along the old road! The Park Service has a few carcass dumps located in the park that they don't really advertise. So as I made my way up the old Mesa Road, I ran into a sign that said, "
WARNING! Due to Bear Danger Area Beyond This Sign Is Closed To All Travel." Well, for those who know me, a bear sign wasn't going to deter my finding the Howard Eaton, so I continued up the road. I should add that it had snowed about an inch the night before and the snow revealed all of the bear tracks that were heading up and down Mesa Road. As, I got closer to the actual dump site, I ran into a severed elk leg in the road, and then what looked like a piece of cooked chicken. How that got there I've often wondered.

At this point I had taken my bear spray out of its holster and had it aimed directly in front of me. As I continued down the road, it had become deathly silent, and then a large raven flew right over the top of my head. The only thing I could hear in the stillness was the woosh, woosh, woosh of its flapping wings. One of the most eerie times I have ever experienced in my life. I continued on and soon ran into a circular clearing that was clearly a carcass dump. Besides all the grizzly tracks, there was a good sized bison carcass near the middle of the clearing, and various piles of bones throughout. It appeared to me that bears had taken some of the remains and dragged them into the surrounding trees around the clearing. Deathly silent, but no bears that I could see. I didn't stay for long and left the dump to continue along the road. This might be the bravest, or stupidest thing I have ever done. Eventually, I ran into a telephone line cut that crossed the road, and there was a telephone on one of the poles. I so wanted to pick it up and order a pizza.

Anyway, soon after the telephone in the middle of nowhere, I cut off the road and bushwhacked until I found the old Howard Eaton Trail. Definitely a day to remember. Oh and by the way, I lost my bear spray on the way down the rocky cliffs on the east side of Gibbon Falls. If anyone finds it could you please return it to me?
Story 3 - My first hike to Perkins Peak along Parley's Ridge here in Salt Lake City caused me some concern back in the day. It was mid April and I headed to Perkins from the valley floor. Just before reaching the summit a storm rolled quickly in from the west and the next thing I knew I was in a whiteout. Needless to say, I didn't make the summit and I started making my way back slowly along the ridgeline. To get to Perkins, you essentially were following a game trail near the ridgeline. Of course, I had no idea where the game trail ran at this point, so I just stayed at the top of the ridge and headed west towards the valley. This required a lot of bushwhacking on my part, but I eventually made it back down, and as I neared trail's end, the sun popped out and it turned out to be a beautiful rest of the day. Definitely the scariest I have been on a local hike.