Hm I've never heard waterfall before, this is what I've always considered as a gravity bong:

Gravity Bong making How to make a gravity bong instructions for gravity bong making guide to making a gravity bong
liquid swords Reviewed by liquid swords on . Sir Edward the Penguin Cookie Jar Gravity Bong The title says it all. I made my first gravity bong today from a 2L pop bottle and a ceramic penguin cookie jar, named it Sir Edward, and proceeded to get stoned out of my mind. I'm just coming down from an amazing trip now... alot of my friends also find that gravity bongs somehow give better hits. Does anyone else share this opinion/know why? Also, anyone have good tips for impoved use of gravity bongs? I'm gonna try to get my hands on a digi cam so i can post pics of it... looks so Rating: 5