You drank a cocktail you were unhappy with -- by finishing it, you're saying it was acceptable to you. Then you ordered another one. Did you finish that one as well?

You could have contested the drink charge of your second drink if you didn't finish it. But if you drank it down and expected it to be taken off your bill, you were mistaken.

For the record, Applebee's corporate policy is to pour very weak drinks, to avoid liability for the actions of drunken patrons. A standard long island iced tea should have 4-5 shots of liquor in and it should knock most people on their butts. An Applebee's LI iced tea has the equivalent of two shots of liquor (half-shots of four kinds of booze).