You say, "Hey there, Buster. How’s it goin?"

He says, "Who you callin Buster, Jackass? How about I bust you open a new mouth!"

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Options:

You say, "Who do you think's calling you Buster, Buster? I don’t see anyone else in here. Do you?"

You say, "Whoa there, fella. Just tryin to break the ice. Ya know what I mean?"

You call for a guard.