A number of years ago, I stopped in a place where I was supposed to meet a friend for dinner. Since I was early, I sat at the bar and ordered a Martini. I was the only customer at the bar. The bartender made the drink in front of me and poured the drink into a classic Martini glass. There was probably an ounce or two left in the shaker. He then proceeded to pour the remainder down the sink. I was somewhat shocked and asked him why he did that and he told me that there was plenty more where that came from and that if I wanted another drink, I should order it.
Well, when my friend came, I suggested that we should go to a different restaurant. He agreed and when we left I called the bartender over and threw a penny on the bar. When he asked me what that was for I told him it was to keep company with the drink he threw down the drain.
Has this ever happened to you? I don't expect bartenders to give away their owners business but if they make a mistake is it acceptable to throw it away rather than give it to a customer? WTF was he thinking, that I'd order another drink and he'd get twice the tip?