I can't help to think that since you were high the long wait times were probably a lot shorter than you think. You also don't know what kind of day she was having, although she isn't supposed to bring that to work with her, it doesn't mean she won't. A lot of waiters and waitresses have to serve PoS customers who think the world is owed to them because they are customers. And 15%? Really? I feel bad when I only leave 20%.