Invisible pen?

Question:where can i get a pen with a mini blaack light in the lid so me and my friend can write note without the teacher knowing lol

Best Answer - Chosen by Asker: where can i get a pen with a mini blaack light in the lid so me and my friend can write note without the teacher knowing lol

Something like this?....
http://www.myjewelthief.net/sec-pen.html

Several places sell them online...do a Google search for
"black light pen".