Ice fishing on Lake Superior, for me too. My buddy and I were out on a ledge of 15" thick ice off 21st Ave in Duluth. We were about 50 yards out on a sheet of ice about 100 yards wide. Fished in the shack mesmerized looking down the whole in the clear water for 45 minutes, then looked out and we were maybe 20 yards from open water. We immediately pulled up our gear and got off the ice. By the time we had everything loaded in the truck the ice we had been fishing off was floating free out into the lake. Pretty scary "what-if" scenario...

Edit* AND LIGHTNING! I have so many memories of paddling through white caps in bad lightning storms, walking on elevated railroads through lowland bottoms in bad lightning storms, and of course Joy's and my Deathmarch last summer for those of you that remember that story...