A seriousness bong is also known from time to time as a cylinder, waterfall, depth arraign or a sinker and is a machine used for smoking weed by creating a void where the suction shaped forces air to go through a bowl and fill a urn with smoke.

The Waterfall Method
This technique is also recognized as a waterfall bong or "flood". A "waterfall" is shaped by having a artificial bottle with a hole at the underneath, complete with a detachable bottle cap with a bowl fixed into it.

The bottle cap is taken away and the hole is enclosed by a finger and the bottle is filled with water. Whilst putting a flame to the bowl to brightness the material the finger is taken away. Gravity makes the water flow out and causes the smoke in the assembly opportunity to emptiness out - from where you inhale.