spook
funk
send shivers down someone's spine
put the heart across one
scarecrow
make someone's hair stand on end
panic
piggle
shit oneself
curl someone's hair
flay
dismay
spook out
jitter
jump in one's skin
appal
horrify
take fright
appall
alarm
frighten
quake in one's boots
fray
get the wind up
have the wind up
geek out
rattle
make someone's jaw drop
freak out
disorder
surprise
frighten the piss out of
disquiet
cark
give someone the creeps
distract
trouble
unhinge
perturb
begruntle
make someone's skin crawl
put the shits up someone
run scared
fuss
startle
have kittens
scare the living daylights out of
fear
white-knuckle