-- however canned -- makes for unexpectedly giddy viewing . 
(ROOT (S (NFP --) (ADJP (RB however) (VBN canned)) (, --) (VP (VBZ makes) (PP (IN for) (NP (ADJP (RB unexpectedly) (JJ giddy)) (NN viewing)))) (. .)))
(ROOT (S (NFP ) (ADJP (RB ) (VBN )) (, ) (VP (VBZ ) (PP (IN ) (NP (ADJP (RB ) (JJ )) (NN )))) (. )))