Great thread idea Dan!
1- I was reeling in my line, watching my lure as it approached the boat. Just as I was pulling my lure out of the water, a huge silhouette rushes up towards my lure, makes a huge splash in the water, jumps out of the water and..... fly's away! haha, I took me a few seconds to realize this was not a flying fish but a loon/duck. Completely messed me up for a few seconds, I thought I was losing my mind.
2- While I lived in Alert for a few months the local Arctic wolves would nip at our boots and snow pants while walking around. The first time I walked onto the tundra alone I was surrounded by this pack of 6 or 7 very tall wolves. They just eyed me out for a while and then turned. I later learned after telling my story, that the wolves were just looking for me to kick up some lemmings or rabbits from the rocks.
Those are the two that come to mind