Heights. My dh took me on the big Ferris wheel at Southbank last week and I totally freaked out and had to press the panic button to get off. Bit funny as I used to work at great heights in planes but it just felt totally different.
Horses. Actually I love horses but Iam terrified of riding them.
Germs and sickness. I swear I'm a fruit loop when it comes to germs. I disinfect everything and freak out a bit if I'm stuck in a lift or a line with a sick person.