screams at the top of their lungs no matter what the situation 
(ROOT (S (VP (VBZ screams) (PP (IN at) (NP (NP (DT the) (NN top)) (PP (IN of) (NP (PRP$ their) (NNS lungs))))) (ADVP (RB no) (RB matter) (SBAR (WHNP (WP what)) (FRAG (NP (DT the) (NN situation))))))))
(ROOT (S (VP (VBZ ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (NNS ))))) (ADVP (RB ) (RB ) (SBAR (WHNP (WP )) (FRAG (NP (DT ) (NN ))))))))