Wow, this is really sleazy. It's pretty clear you knew you were substantially undercharged, tried to take advantage of an innocent mistake, and are reacting poorly when reality set in and you found yourself actually having to pay what you should have been charged. As VintageGent says, you clearly knew you were trying to score free drinks off the bar by not questioning a bill that any reasonable person would realize was the product of an unintentional error (had the bartender really been trying to hook you up, he would have confirmed so and let the bill stand had you questioned it). I know drinking at bars is expensive and that getting a good deal is always nice, but to come in here and expect people to support you in throwing a fit and making yourself act the victim in a case where you're quite clearly trying to rip off an establishment is just a depressing spectacle to watch. Hopefully the bar won't just roll over and take the scam you're trying to pull.