it possible for the viewer to doze off for a few minutes or make several runs to the concession stand and/or restroom and not feel as if he or she has missed anything 
(ROOT (S (NP (NP (PRP it))) (ADJP (JJ possible)) (SBAR (IN for) (S (NP (DT the) (NN viewer)) (VP (TO to) (VP (VP (VB doze) (PRT (RP off)) (PP (IN for) (NP (DT a) (JJ few) (NNS minutes)))) (CC or) (VP (VB make) (NP (NP (JJ several) (NNS runs)) (PP (IN to) (NP (DT the) (NML (NML (NN concession) (NN stand)) (CC and) (, /) (CC or) (NML (NN restroom))))))) (CC and) (RB not) (VP (VB feel) (SBAR (IN as) (IN if) (S (NP (PRP he) (CC or) (PRP she)) (VP (VBZ has) (VP (VBN missed) (NP (NN anything)))))))))))))
(ROOT (S (NP (NP (PRP ))) (ADJP (JJ )) (SBAR (IN ) (S (NP (DT ) (NN )) (VP (TO ) (VP (VP (VB ) (PRT (RP )) (PP (IN ) (NP (DT ) (JJ ) (NNS )))) (CC ) (VP (VB ) (NP (NP (JJ ) (NNS )) (PP (IN ) (NP (DT ) (NML (NML (NN ) (NN )) (CC ) (, ) (CC ) (NML (NN ))))))) (CC ) (RB ) (VP (VB ) (SBAR (IN ) (IN ) (S (NP (PRP ) (CC ) (PRP )) (VP (VBZ ) (VP (VBN ) (NP (NN )))))))))))))