Have you ever wanted to sneak a knife somewhere? (Not saying you should) Well here's a way to sneak a knife in a Sharpie marker. Thanks to Pat Sowers for the idea of making a blade with a binder. Please check his instructable because it is a pretty good one. I'm making the blade with a binder because its easy to obtain. You can always use another way. If you are 18 and under and making this knife to bring to school, PLEASE don't. You can get immediately suspended, expelled, or go to jail for position of a knife in school. Also if you're under 18, please have parent or guardian supervision.
Step 1: Legal Stuff
I am not liable if you harm anyone or anything with this knife. I am not liable if you hurt yourself or lose a friend because you accidentally cut him/her. I am not liable if you get caught with the knife and go to jail. I am not liable in you get suspended, expelled or go to jail. Be safe and stay in school.