And any good businessman knows y'don't follow that rule t'the letter or your customers will walk all over you and run y'into th'ground.
Besides, a bartender needs t'tell someone when enough is enough too. Can't follow that rule then when the obviously sloppy drunk is demanding more booze. In that case, th' customer is no longer right, for th' sake of everyone.
[He almost fills his glass anyway but honestly, this is a fun game. He wants to see if he can make Spike say it.]
C'mon, it's jus' one little word. Consider it my tip or payment. I'm givin' away free booze here.