Also, my brother talks of his infamous "autocarb experience." Supposedly, He took a very large bong with a removable stem and rubber-sealable stem insert and drilled a hole in it and managed to hook up an oxygen tank to it. From his account he'd fill up this much-too-massive (think gallons) with a very huge bowl, seal it off, and he and his friends would take turns clicking the tapered valve he had on this bong to push the air in automatically.

I don't know about this though... What do you guys think?

--mic