Impractical fear?

When I had Sega Genesis as a kid, there were certain sound fonts used in the sound chip that would make me very nervous or scared. Most notably, the music from the Jurassic Park and Aladdin Genesis games freaked me out and I have no idea why. While I'm not afraid if it's sounds anymore, I'm still more spooked by pixilated horror images than modern graphic horror images.

Irrational fear?

Being eaten alive by anything. While it may be a fetish for many, the thought of still being alive while slowly being killed in a cramped, smiley tomb while not being able to do anything is very unsettling. Perhaps the only way that might happen is if I was in the ocean and a whale accidentally ate me while trying to eat some seagulls on the surface. Probably won't be likely. I still feel uneasy when I see vore in a game, movie, etc.

Rational fear?

The thought that any one of my older family members may develop Alzheimer's and forget who I am. I've heard several horror stories of the first time a mom or dad started acting clueless when their child(ren) and not responding well to affection from them. I pray this doesn't happen to me or anyone else.