The things I fear the most, the things which make me uneasy, are mean dogs and swords.
I was once in a gun shop and a customer and his wife were handling a quality reproduction sword. The guy turned to me and sort of jokingly drew the sword back. I told him politely but firmly that he made me nervous and to please not do that. As a matter of fact he scared the dickens out of me. The fact that the guy was a little weird probably contributed to the sensation.
I know most people probably don't share the same fears as me, but still I think that is one of the reasons I keep several swords, spears, and a dog for protection, as well as guns.
I'll tell you what is nasty is one of those razor tipped hunting arrows. They make nasty wounds.