You Are Number Six/Newspaper Comics

Examples of in  include:

"Lucy: This is his way of protesting, huh? 5: No, this is his way of giving in!"
 * In the early 1960s, Peanuts had a character named 5 (full name 555 95472). His sisters were 3 and 4. 5 said that his father named his kids that way as a reaction to all the numbers (such as the then-new ZIP Code) being put on people in modern life.