I have a lot. Here are the ones that come to mind though...
Putting on my shoes... I'm always afraid a spider or some equally creepy bug is in hiding, waiting to make a meal out of me (thank you, Arachnophobia).
The "biscuits in a can" that pop when you open them (think Jack-in-the-Box... which also freaked me out as a kid).
Long fingernails on men. :shudder:
Ok, what's yours?