I sometimes make a machine, not many people have heard of it. Take the regular sized gatoraide bottle with the big spin top not the one u suck out of. Cut a whole about the size of the shaft of a pen in the lid and one in the middle of the bottle on the side, get a tube that fits in the holes u made, i use fat pens and just cut them to size. Put one tube in the whole in the lid and one going down the whole in the middle, leave them have in and half out. Take a joint and push the end into the tube thats in the lid on the INSIDE, get the dub rocking and put the lid back on so the joint is burning inside. Get someone to blow into the tube in the middle of the bottle, the air will burn the joint and push the smoke out the other tube stand without putting ur lips on the tube and inhale the smoke, hold it in, and then release your hit into the other tube and let your partner take the hit, it will be twice as much smoke cause their inhaling some smoke from ur hit and the new smoke, try going as long as u can. Usually the seal on the tube wont be good so you may have to wrap tape around it or use somthing else.