The drummer, who is wearing white, is laughing.
A drummer laughing at a joke.
Not all laughter stems from a joke.
exists e1 e2 p1 x1 x2.(n_drummer(x1) & Actor(e2,x1) & v_laugh(e2) & exists s1.(Theme(s1,x2) & a_white(s1)) & Topic(e1,p1) & Actor(e1,x2) & v_wear(e1) & (x1 = x2))
exists e1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_joke(x3) & Actor(e1,x2) & v_laugh(e1) & (x1 = x2) & n_drummer(x1))