yeah really no kidding
( ( yeah really ) ( no kidding ) )
(ROOT (SINV (VP (VBP yeah) (ADVP (RB really))) (NP (DT no) (NN kidding))))
It's crazy! 
( It ( ( 's crazy ) ! ) )
(ROOT (S (NP (PRP It)) (VP (VBZ 's) (ADJP (JJ crazy))) (. !)))