Pull gravitys. That shit will get you STONED. I'm sure everyone who has done it will agree.

Incase you've never done gravs before, heres a wiki that will explain how to make one - http://en.wikipedia.org/wiki/Gravity_Bong

I wouldn't try the water-fall style, but the other kind.

Thats the best way to get as stoned as you can I think. Just load up a fat bowl, and hit it as hard as you can, pushing down the bottle helps force the smoke into your lungs and gets you really high, and it will all hit you at once. I used to take like 1 grav and be pretty high, but depending on your tolerance, I'd say keep doing them untill you feel stoned.

In fact...I might have to pull some gravs soon, I haven't been getting as high lately. I really like when the high just hits immediately and time stops for a second.