I am serious. These things scare the bejesus out of me!
1) overly large spiders
2) being followed
3) being upside down
4) being tickled for too long and dying from loss of air
5) strange noises at night
6) bike riders speeding past me
7) bees
8) decapitation (I've seen pictures...)
9) heights
10) falling
11) zombies
12) being kidnapped
13) some tall people
14) pain
15) getting lost
16) being alone
17) disturbing dolls
18) Titanic documentaries (don't ask)
19) things that pop out suddenly
20) urban legends (they make me tingly)
21) Telephone Tammy, the doll that tried to kill me and Becky when we were ten
I'm sure there're more. I'll add to this as I think of them/realize them. ;-)