small homemade pipe

I need an idea o make a pipe out of someting small and transportable, Something that is homemade yet i can put it my pocket, and hide

Any ideas?

Metal Pen center...Coke can(put the can in the place you are going to smoke in then take a knife or pen with you and make a few tiny holes and use it.

you could use aluminum foil and a pen...

a can....

or use an inhaler and cover the top with aluminum foil and poke a few holes in it

or you can not be stupid like these "kids" and just use: sockets? Fruits and Vegetables? Something not linked to alzhiemers disease like oxidized aluminum. Wtf. And if you have some time to yourself bust out the spoons(easier than knives) and a propane torch(quicker but not more convient that a stove)