I don't remember, but only, only a fractured collarbone, which I recommend to anyone that needs to break a bone, break a collarbone.
( ( ( ( ( I ( ( do n't ) remember ) ) , ) but ) ( only ( , ( ( ( ( ( only ( a ( fractured collarbone ) ) ) , ) ( which ( I ( recommend ( to ( anyone ( that ( needs ( to ( break ( a bone ) ) ) ) ) ) ) ) ) ) ) , ) ( break ( a collarbone ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP I)) (VP (VBP do) (RB n't) (VP (VB remember)))) (, ,) (CC but) (S (ADVP (RB only)) (, ,) (NP (NP (RB only) (DT a) (JJ fractured) (NN collarbone)) (, ,) (SBAR (WHNP (WDT which)) (S (NP (PRP I)) (VP (VBP recommend) (PP (TO to) (NP (NP (NN anyone)) (SBAR (WHNP (WDT that)) (S (VP (VBZ needs) (S (VP (TO to) (VP (VB break) (NP (DT a) (NN bone))))))))))))) (, ,)) (VP (VBP break) (NP (DT a) (NN collarbone)))) (. .)))
I would recommend to break a collarbone of all bones. 
( I ( ( would ( recommend ( to ( break ( ( a collarbone ) ( of ( all bones ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (MD would) (VP (VB recommend) (S (VP (TO to) (VP (VB break) (NP (NP (DT a) (NN collarbone)) (PP (IN of) (NP (DT all) (NNS bones))))))))) (. .)))