I developed an intense phobia of receiving injections for a few years, and I would pass out. I'm glad that's over now. I still don't like it, but I can remain conscious afterwards!
I have also always been creeped out by vague shapes underwater in lakes, or the parts where you can't see anything, or seaweed... all of these lake experiences that contriibute to the feeling that maybe I don't really know what's down there.