Suspense and Shock

Imagine a scene in a film similar to this ( Classroom, students,teacher). The camera reveals that there is bomb under the table to the audience but we the (students and teachers) are unaware of it. 

• Will it be saved.
• Will the bomb go off?

This is suspense and dramatic irony.

Now imagine the same scene except that instead of the camera revealing the bomb under the table , without any warning it explodes and kills alls.

This is an example of the use of Shock.