How To Make Jumpscares In Minecraft!

//Watch my youtube video for help:

//Summon Armorstand
> /summon ArmorStand ~ ~1 ~ {CustomName:"j",Invisible:1,Invulnerable:1}

//give player slowness when near armorstand
//set this command block to repeat and always active!
> /execute @e[type=ArmorStand,name=j] ~ ~ ~ /effect @a[r=1] slowness 1 2 true

//play scary sound
//set this command block to chain and always active!
> /execute @e[type=ArmorStand,name=j] ~ ~ ~ /playsound entity.endermen.scream voice @a[r=1] ~ ~ ~ 1 1

//give player blindness near armorstand
//set this command block to chain and always active!
> /execute @e[type=ArmorStand,name=j] ~ ~ ~ /effect @a[r=1] blindness 1 5 true

//kill armorstand after the previous command
//set this command block to chain and always active and conditional!
> /kill @e[type=ArmorStand,name=j,c=1]