Scream collector

Been there and done that!

I could power my whole suburb

Nowadays it would be continually powered due to the SJW's

The cast of Dragon Ball Z could fuel the planet forever.

Also, laughter is more effective. So just put some in asylums.

You could have one of those and put a loud speaker in front of it and play music, Sound for energy=Energy for speaker. UNLIMITED POWER

Eskom (the local power utility) would work SO much better with this kind of thing...