I hope you're an exception. Tipping on the full amount should be a fairly well-known practice. Also, your receipt will probably show the original price and the final, discounted price. You shouldn't need to remember the menu.

That's a huge assumption. It's something I also have never heard of until reading this post.

I'm personally bothered by the entire tipping culture in the US. Once used to acknowledge that someone has gone above and beyond, now it is just used by businesses as a means to pay below minimum wage (which is too low already). The fact that it is also percentage based this means a person working at a restaurant with higher prices likely makes more money just because I'm charged more for the food. This doesn't seem fair to those workers who are wait staffing at a more affordable restaurant. I can tip above standard percentages at those restaurants, but this isn't going to translate to the whole.

It is also well known that other discriminatory issues factor in to tips (age, gender, race, attractiveness, etc...)

Bottom line, tipping should be thrown out as an expectation and should have zero impact on wait staff wages. Restaurants should be forced to pay at or above minimum wage and menu prices can be adjusted accordingly. As dependent as today's society is on the food service industry, maybe it is about time they unionize and start striking at the local and/or national levels until some laws are changed to treat them fairly.

I've never heard of the idea that you should tip full amount. That sounds like one person's opinion rather than custom. I should provide the disclaimer that I haven't used a coupon when eating a meal, so I may not have had the opportunity to come across it.

It's basically just common sense. The server does the same amount of work whether the meal is priced at $100 or $50.

That goes back to the gratuity pricing being a percentage of cost is a problem in itself. If I go to an Applebees or a private "upscale" restaurant the pricing will be significantly different, but the effort required by the server will typically be similar.

That even applies to the same restaurant. If I order a $10 plate of noodles or a $25 steak the server is still carrying one plate out either way.

I'll add to the discussion that until a bartender friend of mine taught me about this a couple of years ago, I had no idea. I asked a few friends and family if they were aware of this and it was a real mixed bag.

I think there are a lot of people like me who before groupon, never used a coupon at a sit down restaurant in my adult life, and therefore it was never something I ever had to even think about.

Sure, but it is obvious, right? You aren't going to give them no tip because the deal was free after you bought the coupon?