Maybe the brick from 2008 is trying to give him a command.
Sit? Stay? Speak?
That's got to be it. So Herbie howls and howls along with the ancient communications tool.
His ears - the pointy, oversized models so characteristic on German shepherd puppies - may also make him especially receptive to the siren call of this strange device.
Sing it, Herbie. This song's for you.