We had a $15 Restaurant.com certificate so we decided to use it last night. We ordered Chicken65, Goat Vindaloo, and Chicken Saag. The food was delicious. However, when it was time to pay, the server added 18% gratuity without telling us just because we used the gift certificate. When we asked because the final credit card charge didn't make sense, then she decided to tell us it was 18% gratuity she tacked on. I told her that we would have tipped her 20% of the full price, then she said, well, the 18% wasn't really tip, it was gratuity. Tip is gratuity and should be voluntary for a party of 2. They should have trusted the customer to do the right thing, Or at least have a sign that tells us about the automatic tip in advance. Better yet don't join the promotion at all if they don't want to deal with people coming in with the coupon.