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Two answers to this joke.
Knock, Knock!
Who's there?
Witch.
Witch who?
Witch one of you can fix my broomstick?
Witch one of you will give me some Halloween candy?
knock knock, whose there "FBI OPEN UP" "fbi open up" who? OH WAIT RUNNNNNN
Knock knock who is there pig pig who? Pig up your feet so you don't twip!
Then it rips.... nothing, but you might knock the chick up... or he might knock you up
Yes there is! Try this one. Go up to someone and tell them to say "Knock, Knock".
When they say "Knock, Knock", you ask, "Who is there?" I love that one!