Ok well this is my idea....This is what i call the Gravity Bong...OF DOOM!!!....lol anyway just picture ok you get 3 2 liter bottles...and 2 1 or 2 liter bottles one better....ok now cut the top off of both 2 liter bottles like so thers no neck on it or any part of that now line all the 3 liter bottles up in a line and put a 2liter bottle in between the 1st and 2nd one on the left and then once in between the 2nd and 3rd one on the right now cut a hole in each side of the middle 3 liter and and put the 2 1 liter bottles in each of the holes and conect the 3 bottles.....with the 1 liters by putting them in the side of each of the 3 liters...so there connected and make like a line of 3 liter bottles and with a one liter bottle in between them both and now make ur bowl heads on the top of each of the three bottles and there you go one like ....OH MY GOSH..instead of gravity bong ...is a da na na BLACK HOLE BONG!!!!...lol well let me know what u think and sorry im a little stoned so if u dont understnad jus ask me ...[]Deace keep cillaxing