`` He happened is who to used waist-high .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (TICK_0 ``) (NP_1 (PRP_0 He))) (VP_3 (VBD_1 happened) (VP_2 (VBZ_0 is) (SBAR_0 (WHNP_0 (WP_0 who)) (S_2 (VP_0 (TO_0 to) (VP_1 (VBN_0 used) (ADJP_0 (JJ_0 waist-high))))))))) (DOT_0 .)))