, i would imagine , as searching for a quarter in a giant pile of elephant feces ... positively dreadful . 
(ROOT (SINV (, ,) (S (NP (PRP i)) (VP (MD would) (VP (VB imagine)))) (, ,) (PP (IN as) (S (VP (VBG searching) (PP (IN for) (NP (DT a) (NN quarter))) (PP (IN in) (NP (NP (DT a) (JJ giant) (NN pile)) (PP (IN of) (NP (NN elephant) (NNS feces)))))))) (, ...) (ADJP (RB positively) (JJ dreadful)) (. .)))
(ROOT (SINV (, ) (S (NP (PRP )) (VP (MD ) (VP (VB )))) (, ) (PP (IN ) (S (VP (VBG ) (PP (IN ) (NP (DT ) (NN ))) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN ) (NNS )))))))) (, ) (ADJP (RB ) (JJ )) (. )))