But then, ha, ha that changed quickly.
( But ( then ( , ( ha ( , ( ( ha ( that ( changed quickly ) ) ) . ) ) ) ) ) )
(ROOT (S (CC But) (ADVP (RB then)) (, ,) (ADVP (RB ha)) (, ,) (VP (VBP ha) (SBAR (IN that) (S (VP (VBD changed) (ADVP (RB quickly)))))) (. .)))
That changed to different topic.
( That ( ( changed ( to ( different topic ) ) ) . ) )
(ROOT (S (NP (DT That)) (VP (VBD changed) (PP (TO to) (NP (JJ different) (NN topic)))) (. .)))