that watching it leaves you giddy 
(ROOT (SBAR (IN that) (S (S (VP (VBG watching) (NP (PRP it)))) (VP (VBZ leaves) (NP (PRP you)) (S (ADJP (JJ giddy)))))))
(ROOT (SBAR (IN ) (S (S (VP (VBG ) (NP (PRP )))) (VP (VBZ ) (NP (PRP )) (S (ADJP (JJ )))))))