I wouldnt get all bent out of shape here. The mood thing- I usually go out in a good mood, crappy service does upset me and dampen that good mood. The issue isnt about how much tip percent blah blah blah. It is about the customer was treated like crap then forced to pay for it. People will tend to be more civil when not forced to do things. Forcing me to pay an amount after a bad experiance would make me livid. I would have just snapped, broken a window, claimed PTSD, and walked out. That's just me. No one is hurt (other than feelings), I look like a bad ass, and then I dont even sue them for imprisoning me and my family. Did I mention I pay for the food? Ya, I do that too.