Pen games are pranks that involve playing a joke on someone by writing something where it shouldn’t be or by changing something they’ve written to something else. In high school and in college I used to write on the cover of other peoples’ notebooks. Drawing “I little boys” in large letters on your friends’ notebooks is a sure way to embarrass them. Nudity and fornication doodles also work wonders.
My favorite pen game is to add items to someone’s written reminder list. I especially enjoy writing on lists that are displayed in open view, where guests may see them. Once I added “condoms” in fairly large letters to the end of my girlfriend’s grocery list, which happened to be stuck to her refrigerator. The next day her dad was visiting before she had noticed the extra item on her list. She had a hard time convincing her father she had not placed the item on her list because I made it look like her handwriting. I thought this practical joke was rather humorous until her father punched me in the gut and spit on me the next time I saw him.