Seeing as this appears to be serious about fears, I'll adit that I am shit scared by taranshulas. If I see a picture of one, I flinch immediately. If I see one on TV, I shield my eyes instantly.
Because I've had a few drinks, I'll admit to being afraid of my people (white, English) not being able to defend themselves against total influence from America, the EU, and the constant influx of asylum seekers. When you're sober you tend to blot it out unless you're with like-minded friends (unless you're pissed off/feeling brave), but right now...fuck it: England for the English!