I have several, although none of them are severe to the point where I can't function around these things.
Scissors; I can't trace this back to some freudian event in my childhood, but I'm terrified of having my digits chopped off, and scissors simply look like exactly the right kind of tool to do this. I can use them if I have to, but I really prefer to avoid them. Cigar cutters are even worse, especially the circular ones, which are designed to lop pieces off finger-sized objects.
Helicopters; I was on a helicopter tourism ride once when I was young, and the pilot left the doors open (we were belted in, of course). My poor little young self was paralyzed. To this day I won't ever get on a helicopter for any reason (not that there's usually a need to, anyway).
The ocean, or specifically, being on a ship in the ocean; I discovered this the first time I went on a cruise. The water itself doesn't bother me (I'm fine with the beach, for example), but once I'm out of sight of land, I freak out. I'm a nervous wreck for the duration of any voyage until I can see the coastline again. Ironically, I don't get seasick. At all.