20180816_juice_pack_bass_rumble_groan_straw_plastic.wav

A peculiar local brand of fruit juice sold in small plastic bags with a straw will sometimes vibrate violently when sipped, producing this deep groaning sound.

I've yet to discover what exactly causes this to happen. When trying to record it I experimented with straw positioning, sipping strength, holding angle of the pack, and couldn't get it to consistently rumble. This may be a marketing conspiracy to get audio people to stock up on juice to master how to perform the packaging.

Recorded with Sony PCM-D100, edited and denoised in iZotope RX 7.