It spoils the sport.
( It ( ( spoils ( the sport ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ spoils) (NP (DT the) (NN sport))) (. .)))
It ruins the fun.
( It ( ( ruins ( the fun ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ ruins) (NP (DT the) (NN fun))) (. .)))