's equally hard to imagine anybody being able to tear their eyes away from the screen once it 's started 
(ROOT (S (VP (VBZ 's) (ADJP (RB equally) (JJ hard)) (S (VP (TO to) (VP (VB imagine) (S (NP (NN anybody)) (VP (VBG being) (ADJP (JJ able) (S (VP (TO to) (VP (VB tear) (NP (PRP$ their) (NNS eyes)) (ADVP (RB away) (PP (IN from) (NP (DT the) (NN screen)))) (SBAR (IN once) (S (NP (PRP it)) (VP (VBZ 's) (VP (VBN started)))))))))))))))))
(ROOT (S (VP (VBZ ) (ADJP (RB ) (JJ )) (S (VP (TO ) (VP (VB ) (S (NP (NN )) (VP (VBG ) (ADJP (JJ ) (S (VP (TO ) (VP (VB ) (NP (PRP$ ) (NNS )) (ADVP (RB ) (PP (IN ) (NP (DT ) (NN )))) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (VP (VBN )))))))))))))))))