Another one I remember.
I was heading back to Whiterun after doing a Companion quest that takes place fairly close by. Farkas was with me, and it was late at night. Whiterun was close enough that I decided to walk back.
It was a completely uneventful trip until we were right outside the walls of the city. I heard what sounded like a dragon roar and I stopped and looked all around in the sky. I didn't see anything, so I continued on.
Less than five seconds later a dragon swooped right over my head and roared. Scared the crap outta me. He ignored me and started attacked the guards at the gate. I stayed back and shot him full of arrows. He had about a quarter of his health left when he decided to land and attack me and I finished him off easily.
Then, as I was absorbing the soul, Farkas randomly goes, "Oh! A battle!" and unsheathes his sword. Fitting, considering his reputation as being kind of dumb.
That whole series of events was awesome.
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Gamertag/PSN-Murphiroth