I think it may have something to do with the computer system. Once your "table" is entered into the system for the DDP it adds 18% so when you separate the alcohol or other incidentals out it just automatically adds the 18%. I don't have a problem per se with this, but I did have a waitress still circle the tip and add spot on the first reciept I rec'd back. It wasn't until after I tipped and was thinking about how unusually expensive those two drinks were, that I reallized I had tipped a total of 38% and I realized I had double tipped. I think it would be more appropriate for the waitstaff to let you know the tip was included. The other time was when DH ordered a beer the total bill with 18% was $7. I only had a $50 so I gave that to the waitress and she actually asked if I needed change--yup really the service on recieving the beer was not quite $43.00 worth of service! Then I started thinking, do people really tip this much here on a beer--I'm obviously in the wrong line of work!