This is a man with a goofy grin on his face.
He is amused by joke told by a coworker.
JUST BECAUSE THE MAN HAS A GRIN ON HIS FACE DOES NOT IMPLY THAT HE IS AMUSED BY A JOKE OR THAT IT WAS TOLD BY A COWORKER.
exists p1 x1 x4.(n_face(x4) & of(x4,x1) & n_male(x1) & n_thing(x1) & exists s1 x2 x3.((x1 = x2) & with(x2,x3) & on(x3,x4) & n_grin(x3) & a_goofy(s1) & Theme(s1,x3) & n_man(x2)))
exists e1 e2 x1 x2 x3.(Actor(e1,x2) & Actor(e2,x1) & n_coworker(x1) & Theme(e2,x3) & v_tell(e2) & (x2 = x3) & n_joke(x2) & Theme(e1,x1) & v_amuse(e1) & n_male(x1))