A man balances a knife on his arm as another man watches.
A man is balancing a bowling ball on his arm.
a bowling ball is heavy and round, and a knife is small and sharp
exists e1 p1 x1 x2 x3.(exists e2 x4.(Actor(e2,x4) & v_watch(e2) & n_man(x4) & -(x4 = x1)) & n_man(x1) & n_man(x1) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_balance(e1) & on(x2,x3) & n_arm(x3) & of(x3,x1) & n_male(x1) & n_knife(x2))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_balance(e1) & on(x2,x4) & n_arm(x4) & of(x4,x1) & n_male(x1) & n_ball(x2) & of(x2,x3) & n_bowling(x3) & n_man(x1))