Shotgun blowbacks was another insane favorite of ours: put the business end of the joint inside your mouth carefully without burning yourself, and blowback over your partners cupped hands while they take a deep breath. Kicks like 12 gauge. In general anything which is smoking with 2 man operation is a blast. I remember seeing Cypress Hill in Roskilde festival 96: they recently shed all gangbanging references and were only into smoking, finished their concert urging everyone to go and see Sex pistols comeback concert; very nice touch. In any case i met a danish group handling a 2 man operated 4 foot bong which they were preparing for I want to get high. I wonder how they were able to get it in cause you couldnt even being in glass bottles. Terrific concert, when the tune eventually went on the whole front of orange stage got clouded in smoke like the smoke machines from the techno concerts, all from stoners. Lovely memories from that year, possibly the best line up of any festival i ever seen worldwide, including the ones i missed.
Never tried lungs but our buckets where sometimes done using 3 liter strong bow bottles, with mandatory presence in every round or suffer the jibes of the Scottish, which are very very serious when it come to drugs as being on of the main forming activities for the creation of manliness and character. I love all thise days but getting the thread derailed. Will have a look at Lungs; you basicly put the deflated bag over the water and then vaccum pull the bong head thru the top? Sounds like a nasty treat