Once you’ve finished off a bottle of booze, you’re left with ... a hangover and remorse, probably.
But that ringing in your head? Might be music! That's thanks to Cork, a tiny Bluetooth speaker that sits on top of your empty liquor bottle (or, less interestingly, Starbucks bottles) and uses the glass's natural acoustics to amplify sound.
As this video showcases, different sizes and shapes of bottle will produce different levels of noise:
(H/t Laughing Squid)