I don't have the lesson on this computer but there's the zombie game where there are doctors, citizens and zombies.
I can't remember how it's exactly played but the citizens are given actions to perform such as "running in place, jumping rope, tying a shoe, leap frog or whatever.
Make 2/3rds of the classroom citizens, 1/6th zombies and another sixth doctors.
Zombies and doctors ask the citizens "What are you doing?" and they reply while doing the action.
If they are questioned by the zombie they stay still. Doctors can come along and heal them to normal.