An impromptu toast among friends.
friends are thinking
Impromptu really gives the idea of no thinking involved.
exists s1 x1 x2.(a_topic(x1) & among(x1,x2) & n_friend(x2) & n_toast(x1) & a_impromptu(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_think(e1) & n_friend(x1))