Kevin falls<br>Kevin is at a theme park. He goes on the big roller coaster. He is having a great time. The roller coaster goes upside down. Kevin falls out and injures himself badly.
The roller coaster never went upside down
( z1 go :polarity - :ARG1 ( z2 roller-coaster ) :ARG4 ( z3 upside :op ( z4 down ) ) :time ( z5 ever ) )