Finding a use for business cards

I have business cards now. I can't imagine what I would need them for other than to give them to family and friends. However, I found a use. The other night I put one in a drawing for a free Chipotle lunch. Good use for business cards.
Today I get a fax forwarded to me from Chipotle. I won! Lunch for five and low and behold there are five people in my department. Lunch is my treat on Friday.