Because of how loud you say it, it frightens the person from the amount of pitch in your voice.
The word "boo" has nothing to do with it.
You could say "SHEEP" And the person will probably still be frightened.
Yes and its Scare Bear
Casper's Scare School - 2009 Scare Scouts Boo 1-7 was released on: USA: 14 October 2009
To scare people on halloween!
the person
Beetlejuice - 1989 Scare and Scare Alike Spooky Boo-tique 2-2 was released on: USA: 15 September 1990
shout boo in while there in the bath
because 'boo' is something u say when u jump out to scare somone
my baby, scare people, alcohol.........etc.
it puts on a mask and says BOO
Jump out and yell boo!
People say 'boo' on Halloween because it is considered as a 'spooky' time, usually pretending to scare someone.
Because on the movies that's the "sound" for the ghosts!!