Last word first
 

Okay it's really simple. Someone says something like this.

Today is a very nice day

Then take the last word which would be 'Day' in this instance and make a new short sentence.

Day is to Night as Light is to Darkness

It doesn't have to make any sort of sense

So here is the start:

Eduction is the key to freedom

Freedom is Slavery

((sorry, I've had George Orwell on the brain))