This is a non-lucid dream I have had a long time ago, and the one I consider to be the most important to me.
I was walking in the woods where I live, and after a while a bear appeared. Naturally I felt threatened by him, and prepared to be attacked. I had an axe with me, and when the bear attacked me, I hit him several times in the chest and upper body, causing it to bleed alot. I myself did not get a scratch.
The bear fell into my arms, mortally injured and bloody all over his large body. He said a short phrase to me, and I was able to understand it. Now I started weeping, sad that the bear wouldn't be able to survive the injuries I had to inflict on him.
I woke up shortly after in this emotional dream, still weeping in my bed for a while, until I fell asleep again.