Creative Homemades

What do you guys think is the best home made smoking thing you can make? Bong out of a water bottle? Gravity bong? Homemade pipes? Other interesting creations?
Any crazy ideas?

You know that copper tubing for plumbing. Well... four one incher straight bits + one 90 deg bent bit all duct taped together. Worked great. Probably gonna die from copper poisoning though.

a great one i made once -
got a permanant marker, took the nib out and the ink shit inside, made a littlhole in the side and put in a can cone piece and blu tacked it in

did the job great, a lil harsh tho

One i took a two litter coke bottle and used it for the main part of the bong, the i took 2 water bottles and but them on the side and put the tubes and stuff inside and made a triple filtration bong.