, unaware that it 's the butt of its own joke . 
(ROOT (FRAG (, ,) (ADJP (JJ unaware) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ 's) (NP (NP (DT the) (NN butt)) (PP (IN of) (NP (PRP$ its) (JJ own) (NN joke)))))))) (. .)))
(ROOT (FRAG (, ) (ADJP (JJ ) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN )))))))) (. )))