The roller coaster is going through a twist, turning the people upside down.
People are seeing things upside down.
People seeing thing upside down are on a roller coaster.
exists e1 e2 p1 x1 x2 x3 x4.(n_people(x4) & n_coaster(x1) & of(x1,x2) & n_roller(x2) & for(e1,e2) & exists s1.(r_upside(s1) & Theme(s1,x4) & a_down(s1)) & Recipient(e2,p1) & Actor(e2,x1) & Topic(e2,x4) & v_turn(e2) & through(e1,x3) & n_twist(x3) & Actor(e1,x1) & v_go(e1))
exists e1 s1 x1 x2.(r_upside(e1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_see(e1) & n_thing(x2) & n_people(x1))