Man using a vacuum on his lawn.
The man thought his vacuum was the lawnmower.
Using a vacuum on a lawn is illogical so the man thinking the vacuum was the lawnmower explains why he would be doing such a ridiculous thing.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_lawn(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x3) & Actor(e1,x2) & v_use(e1) & n_vacuum(x3) & (x1 = x2) & n_man(x1))
exists e1 p1 x1 x2 x3.(n_lawnmower(x3) & n_vacuum(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & exists p2.(x2 = x3) & Topic(e1,p1) & Actor(e1,x1) & v_think(e1))