or a crutch slipping on a banana peel into a grave. The banana peel could be decorated as the coupon. There is an old saying about referring to someone who is not doing so well as having "a foot in the grave and another on a banana peel". Maybe someone clever can do something with it.

relative to what is spent to use them.

Would you please explain that 1/10c on the dollar for me?

Does it mean that the money that the coupon represents has a value of 1/10 of a penny on each dollar spent? How is this determined for any and all of the varieties of different coupons worth different amounts?

pointing a gun, saying, "Here's a coupon. Give me your Medicare." or "Your money or your life. What the hell, I'll take both."