a mournful undercurrent that places the good-time shenanigans in welcome perspective 
(ROOT (NP (NP (DT a) (JJ mournful) (NN undercurrent)) (SBAR (WHNP (WDT that)) (S (VP (VBZ places) (NP (DT the) (NML (JJ good) (HYPH -) (NN time)) (NNS shenanigans)) (PP (IN in) (NP (JJ welcome) (NN perspective))))))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (NP (DT ) (NML (JJ ) (HYPH ) (NN )) (NNS )) (PP (IN ) (NP (JJ ) (NN ))))))))