The OP in that forum suggested that he saw in a movie
That's where his windage-from-reality problem starts. Think about the sort of folks who write movie scripts.
Then riddle me this - *why* would someone unholster their sidearm and lay it out in a bar? Seems like that'd be interpreted as an anti-social aggressive move.
Also, as far as primary sources go, even period newspaper accounts need to be taken with a pound of salt as tales like this sold more papers.