headed down the toilet with the ferocity of a frozen burrito 
(ROOT (S (VP (VBD headed) (PP (IN down) (NP (DT the) (NN toilet))) (PP (IN with) (NP (NP (DT the) (NN ferocity)) (PP (IN of) (NP (DT a) (VBN frozen) (NN burrito))))))))
(ROOT (S (VP (VBD ) (PP (IN ) (NP (DT ) (NN ))) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (VBN ) (NN ))))))))