My first bear experience felt like a close call, though in retrospect, I don't think it was.
I was about 8, and playing with my dog down by the lake at our cabin. I heard some falling rock on the big sandstone cliff about 40 yards away, and turned to see a big black thing scrambling up a cliff. At first I thought it was this big Newfoundland dog that had been hanging aroung (the cabin is about an hour west of edmonton, not really bear country) but my golden retriever, who was about 11 or 12 at the time, started roaring like a lion and took off after the thing. I saw the brown nose (it's funny, I can still see the detail like it was yesterday), and I realized it was a bear, which now turned and started back down the cliff.
I caught up with the dog before she followed it, dragged her back to the cabin, and stuck her inside. Then, I figured that by walking down the road and over to a lookout about 500 yards away, I'd get another look at the bear, and I didn't think he'd be able to get up the cliff (it's generally maybe 30 or 40 metres high, and he'd tried to climb it at one of the low points.)
So I yelled at my grandma to keep the dog inside, and took off down the road before she could ask questions or try to stop me. I'd gotten almost to the lookout, when, turning a sharp corner in the road, I came face to face with the bear about 15 yards in front of me. I froze - not on purpose, I literally froze - and we just stared at each other for what felt like hours. Finally, he started to back up slowly, and kept going, but he never took his eyes off me.
He was almost around the bend about 50 yards away, and I'd started to get my balls back, and I remembered that you're supposed to be agressive with black bears to scare them off. So I yelled at him.
He turned and stared at me for like 5 seconds, and I almost crapped my pants - I thought he was gonna come right for me. After the longest 5 seconds of my life, he turned and bolted.
My family, who were up in the cow pasture a mile away, some him working through a swamp about 15 minutes later.
In retrospect, it wasn't that close a call - it was a young bear, probably no bigger than 150 pounds, and obviously more scared of me than I was of him, which was a lot. But it sure felt like aclose call.