Who walks around the office or house and slaps the mug over. Its designed to not spill if bumped. Not Punched. Bullet proof glass will eventually shatter if shot with a big enough bullet.

So to be correct the lake should not be there at all. It was an accident that caused the lake. Now they want to keep the lake as a lake and make the rest of drought stricken CA pump water into it. Just have to love the libs of CA.