the only thing i laughed at were the people who paid to see it . 
(ROOT (S (NP (NP (DT the) (JJ only) (NN thing)) (SBAR (S (NP (PRP i)) (VP (VBD laughed) (PP (IN at)))))) (VP (VBD were) (NP (NP (DT the) (NNS people)) (SBAR (WHNP (WP who)) (S (VP (VBD paid) (S (VP (TO to) (VP (VB see) (NP (PRP it)))))))))) (. .)))
(ROOT (S (NP (NP (DT ) (JJ ) (NN )) (SBAR (S (NP (PRP )) (VP (VBD ) (PP (IN )))))) (VP (VBD ) (NP (NP (DT ) (NNS )) (SBAR (WHNP (WP )) (S (VP (VBD ) (S (VP (TO ) (VP (VB ) (NP (PRP )))))))))) (. )))