Well, as I know alot of you people still go to grade school (don't deny it...and as for those who DON'T, I'm not talking about you...)
Well, chalk is being phased out of schools, as apparently, it's not good for the body (Nawwww....). This means dry erase boards.
Hate your teacher? Steal those nice dry-board erasers...the material on them makes a good nib.
Still hate your teacher and want to ruin their ability to teach for the day? STeal their dry erase markers. You can open them, take out the crap liquid that's used for writing, get rid of the nib (or just use it...) and fill it with what ever ink you prefer.
I have another method for a nib (made from some UBER ABSORBENT material...) by opening a certain type of Printer Cartridge and using the sponge thingy (it's not a sponge. It looks like hair, but sucks up ink and water like one...) as a nib in a stolen dry erase marker, but I won't be able to post flicks because I have no camera period...-_-