well i have smoked out of a straw, skate tool, and zippo. and a coupla raunchy home made bongs, but the most insane thing was something my friend had.
it was an old bicycle pump (never used on bikes, mint condition) and he had where the rubber tube used to be a big bowl hooked up. then, about 3 inches from the top (it was like 2-3 ft tall) he had a 1 inch wide mouthpiece. he would light the bowl, pull up the pump handle, and put his mouth on the mouthpiece and hit like there was no tomorrow. i took one hit, it was insane. but i heard bubbling so i assume there was water in it. also, he drilled a hole in the top of the pump plunger with a rubber stopper in it, so you could depress the pump without worrying about wet / flying weed. just remove the stopper, depress the handle, plug it again, and do it all over again! good times!