A person riding a large unicycle.
A unicycle perfomance for entertainment
There are reasons to ride a unicycle other than as a performance for entertainment.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_unicycle(x3) & a_large(s1) & Theme(s1,x3) & (x1 = x2) & n_person(x1))
exists x1 x2 x3.(a_topic(x1) & for(x1,x3) & n_entertainment(x3) & n_perfomance(x1) & of(x1,x2) & n_unicycle(x2))