A man balances a knife on his arm as another man watches.
The men have placed a bet on whether one of them can balance a knife on his arm.
Tha fact that the other man is watching doesn't imply that they have placed a bet.
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 p1 x1 x2 x5.(n_arm(x5) & of(x5,x1) & n_male(x1) & n_thing(x1) & n_man(x1) & on(e1,p1) & exists e2 p2 x3.(exists e3 x4.(on(e3,x5) & Theme(e3,x4) & Actor(e3,x3) & v_balance(e3) & n_knife(x4)) & Topic(e2,p2) & Actor(e2,x3) & v_can(e2) & of(x3,x1) & n_thing(x3) & card_eq_1(x3)) & Theme(e1,x2) & Actor(e1,x1) & v_place(e1) & n_bet(x2))