heres one of my boys at last years cannabis cup, hes at the weed expo and they demonstrait a sick gravity bong about 3:00 into itimp: imp:

YouTube - Cannabis Cup Weed Expo Amsterdam 2006
MadSativa Reviewed by MadSativa on . Invention?? ok i dont know if this has been made already or not SO DONT FLAME AT ME!! but what i did was i took a 2 liter bottle, cut off the bottom and put a bowl on the cap... simple gravity bong right.. but the bowl had a rubber tube that went into the water... so when you pulled the whole thing up the smoke went under water and then got trapped by the bottle... pretty fucking sick Rating: 5