Engineering a bong!
I remember 'Lucinda III' that my mate made a few years back from a water cooler bottle. Six pipes, everyone had to inhale simultaneously. Fun times.
( Boss Keloid Got your mother's maiden name tattooed on my arm, Wed 14 Jul 2010, 11:39, 1 reply, 16 years ago)

best I ever saw
was a hotknife bong made from a wine bottle, some aquarium glue, a rubber tube and a hurricane lamp. It was a design classic.
( Monty Boyce, My cheese game is strong, Wed 14 Jul 2010, 11:45, Reply)

Never underestimate the ingenuity of a stoner
The Maguyvers of the drug world.
( Boss Keloid Got your mother's maiden name tattooed on my arm, Wed 14 Jul 2010, 11:46, Reply)

Pringles tube, bit of wood, 2l Coke bottle, 5m plastic tubing, 2 10cc syringes.
And a bit of a socket set. It was awesome.
(wellgroomedwookiee is a filthy-minded hobgoblin, Wed 14 Jul 2010, 11:49, Reply)

See, the A-Team would build a tank with that

( Boss Keloid Got your mother's maiden name tattooed on my arm, Wed 14 Jul 2010, 11:53, Reply)

Snorkel, boiling kettle, bicycle pump, vacuum cleaner hose.......
...all attached to one of those oil-light projectors* much loved by Velvet Undergound during live sets.
*Monty. Vippers. Anyone. What are they called?
(Tugnut Ex of this parish, Wed 14 Jul 2010, 11:54, Reply)