Hmm... my greatest fear is water. I do not know how to swim and I very scared of the sea, or any other water body for that matter.
Once, my boyfriend and I were on a beach and he really wanted to go jet skiing. I was totally against it, given my fear of water! He forced me to come and assured me nothing would happen. When we were far into the sea, our jet ski toppled over and we fell. Even though I was wearing a life jacket - being so terrified of water - I could feel myself drowning. I clinged on to my boyfriend which stopped him from swimming properly and making sure we both get to the shore. Somehow, he managed to get us on to the shore, and I do not think that I will ever go jet skiing again.