flick that scalds like acid . 
(ROOT (NP (NP (VB flick)) (SBAR (NP (DT that)) (S (VP (NNS scalds) (PP (IN like) (NP (NN acid)))))) (. .)))
(ROOT (NP (NP (VB )) (SBAR (NP (DT )) (S (VP (NNS ) (PP (IN ) (NP (NN )))))) (. )))