that rival vintage looney tunes for the most creative mayhem in a brief amount of time 
(ROOT (SBAR (WHNP (IN that)) (S (VP (JJ rival) (NP (JJ vintage) (NN looney) (NNS tunes)) (PP (IN for) (NP (NP (DT the) (ADJP (RBS most) (JJ creative)) (NN mayhem)) (PP (IN in) (NP (NP (DT a) (JJ brief) (NN amount)) (PP (IN of) (NP (NN time)))))))))))
(ROOT (SBAR (WHNP (IN )) (S (VP (JJ ) (NP (JJ ) (NN ) (NNS )) (PP (IN ) (NP (NP (DT ) (ADJP (RBS ) (JJ )) (NN )) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN )))))))))))