This is going to sound dumb, but my biggest fear is probably of large bodies of water and fish. I was freaked out the few times I had to go on a boat when I was a kid. It's hard to explain, but just knowing that I was on a small little boat in the middle of a huge deep lake just made me really panicked. The fish thing is just kind of random, but goes along with the water. There was this time where my family and I were swimming in a lake just off the shore and these HUGE carp fish just came right up to us, and swam around us and I swear one charged me lol. I will also never go on a cruise and I don't see how people can enjoy them.