It is common knowledge that "boo" is a salutation to satan's minions during the annual feast of helloween.
It is common knowledge that "boo" is a salutation to satan's minions during the annual feast of helloween. As chronicled by that great theologian, Jack Chick, in his famous tract of the same name, BOO! Click on the cartoon panel to see Jack Chick reveal WHO is really behind Halloween.