unexpected moments of authentically impulsive humor 
(ROOT (NP (NP (JJ unexpected) (NNS moments)) (PP (IN of) (NP (ADJP (RB authentically) (JJ impulsive)) (NN humor)))))
(ROOT (NP (NP (JJ ) (NNS )) (PP (IN ) (NP (ADJP (RB ) (JJ )) (NN )))))