The teacher is explaining the steps for CPR with a dummy.
Medium Close Up
A student comes up to help demonstrate what to do.
Most of the students get distracted by the song 'Stayin' Alive'. Teacher gets them to stop and explains that that is not the right thing to do, and if this was real life the person choking would've died.
Another student comes in front of the class and talks about what to do with a dead body.
The students freak out after the other student start breaking the CPR dummy.
The student later gets called to the office to talk about what he did wrong.