I wouldn't say crazy but I have a strange fear of heights.
I've always been fine on a plane never had any fears there, but what I do consider strange is for myself anyway...
I can't look up at the sky, I have a real bad fear of thinking I will get pulled up and I have no idea why, growing up and going to things like firework displays I could never look up due to the fear, even my legs start to become a little weak due to the change of how I'm feeling. It's so weird!