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As simple as that, once you do it you'll see the principle behind it. When you pull the bottle out the water it pulls air in big time through the neck, and if you put burning weed in the way of that air intake all the smoke follows. Like super dark yellow smoke, total bomb. Boom.

Alright sounds bomb!! I'm a dummy I meant gravity bong haha I put bomb lol oops but yeah im so down to bust it just need to find everything i need :) I would be so down to try the bud you be smoking too!! <3

I just googled gravity bong and that's exactly what it is... so disappointed now... do it anyway?

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You know what though that's alright you guys made it your way and that's special! Hehe of course why not ;)