I was a very unbalanced kid.
Thunder
Lightning
Tornadoes
"Grown-up shows" (PG-13/14 on up)
Knives
Swimming
Smoke alarms
Water heaters
Fire
Electric outlets
Dentists/doctors
Vaccinations
Social experiences
Strangers
Roads
Being alone in public
Wild animals
Roller coasters/fast rides (excludes cars)
Might be more, I'll update later.