Denny's® - 20% off Entire Check(ex 11/27)

I went to Dennys the other day and it was a odd experience, waitress was just odd, when I handed her the coupon she said something to the effect we take coupons, credit cards, food stamps etc etc, I don't have any idea what she was talking about really she just kept mumbling on and on, but she did take the coupon and saved me about $4.