We went for dinner last night. When the bill was presented, the waitress started telling us how much tip we should leave. We told her we would leave $10 on a $90 bill. She became upset. We usually tip 15% but the service was so so and they overcharged us on some drinks. I believe you should be able to tip based on the service received. The waitress started saying "That's not enough, we can't live on that". And she rambled on. Well guess what? We will not being going back.