Boys and men, mostly all wearing helmets, hang on to two separate cars while they ride skateboards.
A group of guys is carousing through the streets on skateboard, grabbing onto passing cars.
Just because the boys and men are hanging on to two separate cars does not imply they are grabbing onto passing cars.
exists e1 p1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(rel(e1,x5) & subset_of(x7,x5) & n_man(x7) & subset_of(x6,x5) & n_boy(x6) & exists e2 x8.(Theme(e2,x8) & Actor(e2,x1) & v_ride(e2) & n_skateboard(x8)) & n_thing(x1) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & rel(x2,x3) & on(x3,x4) & n_car(x4) & a_separate(s2) & Theme(s2,x4) & card_eq_2(x4) & r_to(x4) & n_hang(x3) & n_helmet(x2) & n_all(x1) & a_mostly(s1) & Theme(s1,x1))
exists e1 e3 e2 x1 x2 x3 x4 x5.(n_street(x3) & for(e1,e2) & onto(e2,x5) & n_car(x5) & Actor(e3,x5) & v_pass(e3) & Actor(e2,x1) & v_grab(e2) & through(e1,x3) & on(x3,x4) & n_skateboard(x4) & Actor(e1,x1) & v_carouse(e1) & of(x1,x2) & n_guy(x2) & n_group(x1))