Two things that I am terrified of:
Burglars/murderers
Falling from a great height and living.

I saw a TV show and a family was sleeping downstairs after watching a movie together. Someone broke into their house, and the dad was shot. Luckily he survived, and the burglar was caught. Until I can get a real gun to sleep with, my airsoft gun and pocket knife are half of the reason I can sleep at night. It took me months to be able to sleep in my own room after that. Not funtimes fortunately I've mostly overcome this fear, I just won't take the trash out after 9:30 and I don't look out the windows at night time ^.^

And after jumping off of 30+ foot cliffs, I know just how amazing it feels to be free falling for just a few seconds. Unfortunately, after watching several videos of people falling five stories down onto concrete etc. and living, the pain that they must go through for years, I'm terrified of falling and living. However, falling from thousands of feet onto solid ground I wouldn't really mind because that would be insanely peaceful until I died. However, I wouldn't want my family to have to deal with that so not falling at all is just fine with me lol.