thin -- then out -- when there 's nothing else happening 
(ROOT (UCP (ADJP (JJ thin)) (, --) (RB then) (ADVP (RP out)) (, --) (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ 's) (NP (NP (NP (NN nothing)) (JJ else)) (VP (VBG happening))))))))
(ROOT (UCP (ADJP (JJ )) (, ) (RB ) (ADVP (RP )) (, ) (SBAR (WHADVP (WRB )) (S (NP (EX )) (VP (VBZ ) (NP (NP (NP (NN )) (JJ )) (VP (VBG ))))))))