Funny Dirty Joke

( boy 1 ) : you need to say what ever i say in backwards.
( boy 2 ) : okay.
( boy 1 ) : A B C
( boy 2 ) : C B A
( boy 1 ) : 1 2 3
( boy 2 ) : 3 2 1
( boy 1 ) : okay lets make this harder : CRACK MY FINGER
( Boy 2 ) : Finger my crack .