It's just one of those things, you know that happened.
( ( It ( 's ( ( just one ) ( of ( those things ) ) ) ) ) ( , ( you ( ( know ( that happened ) ) . ) ) ) )
(ROOT (S (S (NP (PRP It)) (VP (VBZ 's) (NP (NP (RB just) (CD one)) (PP (IN of) (NP (DT those) (NNS things)))))) (, ,) (NP (PRP you)) (VP (VBP know) (SBAR (IN that) (S (VP (VBD happened))))) (. .)))
It is a thing that just happened.
( It ( ( is ( ( a thing ) ( that ( just happened ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (NP (NP (DT a) (NN thing)) (SBAR (WHNP (WDT that)) (S (ADVP (RB just)) (VP (VBD happened)))))) (. .)))