are so believable that you feel what they feel 
(ROOT (VP (VBP are) (ADJP (ADJP (RB so) (JJ believable)) (SBAR (IN that) (S (NP (PRP you)) (VP (VBP feel) (SBAR (WHNP (WP what)) (S (NP (PRP they)) (VP (VBP feel))))))))))
(ROOT (VP (VBP ) (ADJP (ADJP (RB ) (JJ )) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (SBAR (WHNP (WP )) (S (NP (PRP )) (VP (VBP ))))))))))