A pair of people playing billiards at a pool table.
Two people having fun playing billiards at a pool table.
Answer:  Just because the two are playing billiards does not mean that they are having fun.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & at(e1,x5) & n_table(x5) & of(x5,x6) & n_pool(x6) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_billiards(x4) & (x2 = x3) & n_people(x2) & n_pair(x1))
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_have(e2) & at(e1,x6) & n_table(x6) & of(x6,x7) & n_pool(x7) & Theme(e1,x5) & Actor(e1,x4) & v_play(e1) & n_billiards(x5) & (x3 = x4) & n_fun(x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))