Lightheartedly, I fear any video game or movie that has to do with mutated things! When I played Halo, I thought it would just be a fun game! Colorful worlds, with human-like aliens (slightly comical even, the Grunts were funny ). But then the Flood showed up.
And from then on, the Flood ends up BEING THE FOCUS of the series. I remember I quit playing Halo 2 early because of the Flood. But then a few years later I decided "What the heck, I'm older, I can handle this" and beat the game. Just today I beat Metroid Prime after almost 9 years. I HATE it when games start off warm and colorful, but then ooops, that was a mistake, the game's supposed to be dark, gloomy, full of mutated things I've still got Halo 3 to beat, it's been 4 years and I'm only 30% through the game. I guess it's time to face my fear and destroy the Flood once and for all.
And to the one with the potato fear, don't feel alone in being afraid of things in the kitchen. I HATE knives! And I also hate skillets filled with oil! Has anyone here ever had the oil pop and blow up on your skin? NOOOO!!! Every pop makes me squeal like a girl