I've done horrible, let's just say horrible really, really bad.
( ( I ( 've ( done horrible ) ) ) ( , ( ( let 's ) ( just ( ( say ( ( ( horrible really ) , ) ( really bad ) ) ) . ) ) ) ) )
(ROOT (S (S (NP (PRP I)) (VP (VBP 've) (VP (VBN done) (S (ADJP (JJ horrible)))))) (, ,) (NP (NNP let) (POS 's)) (ADVP (RB just)) (VP (VBP say) (ADJP (ADJP (JJ horrible) (RB really)) (, ,) (ADJP (RB really) (JJ bad)))) (. .)))
I would never ever do something as bad as that. 
( I ( ( ( would never ) ( ever ( do ( ( something ( as bad ) ) ( as that ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (MD would) (ADVP (RB never)) (VP (ADVP (RB ever)) (VB do) (NP (NP (NN something)) (ADJP (RB as) (JJ bad)) (SBAR (IN as) (FRAG (WHNP (WDT that))))))) (. .)))