At first, the adult tries to capture the child's attention by working the toy and, as the clown emerges, exclaiming,  Pop!
( ( At first ) ( , ( ( ( ( ( ( ( ( ( ( the adult ) ( tries ( to ( ( capture ( ( the ( child 's ) ) attention ) ) ( by ( working ( the toy ) ) ) ) ) ) ) and ) , ) ( as ( ( the clown ) emerges ) ) ) , ) exclaiming ) , ) Pop ) ! ) ) )
(ROOT (S (PP (IN At) (NP (JJ first))) (, ,) (S (NP (DT the) (NN adult)) (VP (VBZ tries) (S (VP (TO to) (VP (VB capture) (NP (NP (DT the) (NN child) (POS 's)) (NN attention)) (PP (IN by) (S (VP (VBG working) (NP (DT the) (NN toy)))))))))) (CC and) (, ,) (PRN (SBAR (IN as) (S (NP (DT the) (NN clown)) (VP (VBZ emerges))))) (, ,) (S (ADJP (JJ exclaiming))) (, ,) (S (ADJP (JJ Pop))) (. !)))
The child is happy and laughing when the clown emerges.
( ( The child ) ( ( is ( ( happy and ) ( laughing ( when ( ( the clown ) emerges ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN child)) (VP (VBZ is) (UCP (ADJP (JJ happy)) (CC and) (VP (VBG laughing) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN clown)) (VP (VBZ emerges))))))) (. .)))