I've got a funny drink coupon-related document from an eBay sale. An airline (who won't be mentioned, but lost about a billion dollars last year) spent the time and money to have their attorney send me a cease-and-desist letter for selling a drink coupon on eBay.

Value of free drink to buyer: $3
Value of free drink to airline: 50 cents
Cost of preparing and sending nastygram: $50-100

And we wonder why they keep asking the government for handouts...