Freezing brewed coffee The other day, I had stupid idea:

What if I made my coffee in big batch and freeze what I did not manage to drink?

Let's put away why would I even want to do it. And for sake of argument, I know it is probably bad idea, but still:

Why is it bad idea?
This is a perfectly good idea, if you freeze the coffee as cubes and plan to use them to chill your iced coffee without watering it down.

If you plan to simply freeze the coffee for drinking later I can imagine it being a bad idea, because you will lose some of the flavor. If you even poured milk or cream into the coffee you're planning to freeze, I would even recommend less freezing it, because no kind of milk products can be safely frozen and those are always better used fresh.