I'm a bartender. People try to get free stuff from me all the time.
Notice the key word: "try."
Because one of the basics of Bar Etiquette is that you don't ASK the bartender for free drinks; he/she TELLS you when you're getting them. Those who ask for free drinks almost never get them because, well, they annoyed the bartender by being cheapass fucktards.
I have also had people mistakenly believe that "bar" is the same as "retail" or "bazaar" and try to have me price match.
Again, the key word here is "try."
THEM: "Yeah man, up the street at the Gravekeeper Tavern their Coronas are only two bucks."
ME: "You probably should be drinking them there, then."
THEM: "What, you're not gonna try to beat that price, man?"
ME: "No. Our Coronas are five bucks."
THEM: "That's ridiculous! I don't want to pay five bucks for a Corona!"
ME: "No one's forcing you. But if you want to drink here, that is the price."
Yada yada yada, you get the idea.
"The Customer Is Always Right...But The Bartender Decides Who Is Still A Customer."