Virus'operation: The Sermon analogy

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Imagine you are at a Church service.
The priest/pastor (i.e. user) steps up to give his homily/sermon -- he needs your (i.e. legitimate program) full attention.

A sudden cool breeze (i.e. virus) blows over you, and causes you to doze off just as the sermon begins.

You 'fall' into a trance. (i.e. Idle moment while virus executes)

The sermon ends. You snap out of your 'slumber'. (Virus terminates and allows programme ton run)

Service continues.