There's a fun living/non-living scenario at Biology Corner.
A quick synopsis:
A martian is sent to Earth to find evidence of life. He brings back a car. He's now on trial for not carrying out his duties.
Have your students take on the roles of Defense Attorney and Prosecuter.
I worked with a social studies teacher who was very interested in debate and mock trials. She was always game for teaming up to turn this simple activity into something a little more involved and meaningful for the students. Maybe you work with someone of a similar personality!