DOUBLE COCKTAILS FOR THE PRICE OF A SINGLE!
Maybe its part of the training or maybe it's just the tall, douchey bartender outside of Section 220 last night. But ask for your drink of choice, in my case a gin & tonic, and they will pour you a double without asking. After they give you change for a double kindly explain you never said the word double. After they walk you through, "This is a single, this is a double.", repeat yourself and they will realize you weren't as drunk and/or as stupid as they thought and they will give you the correct change out of their tip jar. After all, that's where your extra money landed to begin with....