Is it right to leave a tip at a restaurant?

Update: Do you leave a tip? How Much? I usually leave 15% of a tip on orders under 30 and 10% on orders of 30. But in a rare case where the service and food is both bad, I'll leave a 50 cent tip. The one time I didn't leave a tip was when I went to a restaurant, where we waited 10 minutes before we were even seated, and by... show more Do you leave a tip? How Much? I usually leave 15% of a tip on orders under 30 and 10% on orders of 30. But in a rare case where the service and food is both bad, I'll leave a 50 cent tip. The one time I didn't leave a tip was when I went to a restaurant, where we waited 10 minutes before we were even seated, and by the time we actually got to order we waited 45 minutes, and had to wait an hour for our food. The place was understaffed, and management sucked. the food was okay, the best part of the restaurant.
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