Anybody who asks  Why a brass monkey? 
( Anybody ( who ( ( asks ( Why ( a ( brass monkey ) ) ) ) ? ) ) )
(ROOT (SBARQ (ADVP (RB Anybody)) (WHNP (WP who)) (SQ (VP (VBZ asks) (NP (INTJ (WRB Why)) (NP (DT a) (NN brass) (NN monkey))))) (. ?)))
No one questions why a brass monkey. 
( ( No ( one questions ) ) ( ( why ( a ( brass monkey ) ) ) . ) )
(ROOT (S (NP (DT No) (CD one) (NNS questions)) (VP (VBZ why) (NP (DT a) (NN brass) (NN monkey))) (. .)))