Looking through my credit card bill recently I realized that I had undertipped at a meal. It was a fairly upscale place and we had a decent bottle of wine; however, I inadvertantly left a 10% tip. If you exclude the bottle it came out to 20%; however, we had a great wine steward and had all the intentions of tipping on the entire meal. What's the etiquette? It was a special occassion meal so we won't be going to the restaurant again soon. And even more embarassing, the restaurant manager was the manager at my favorite watering hole (albeit not a dive watering hole) and he treated us to champagne after dinner! Help!