[header] How to cheat on a test using body parts [title] Write the information in pencil on your fingernails. [step] Naturally, it helps if you can write small. [title] If the teacher suspects something, you can easily rub the pencil marks off. 
[substeps] Some teachers may accuse students of writing test answers on their hands. By writing the answers on your fingernails, you can argue that you are innocent of such accusations.