Every industry has "insider secrets," and that is no exception when it comes to the world of bartending. Be sure to read on to learn more about how they make drinks "stronger," or what drinks you really are wasting your money on, or even how they cleverly cut off intoxicated patrons, and so many more "dirty secrets."
"If a customer asks you to make his drinks stronger (and you are already pouring correctly) pour a tiny drop of the predominant liquor in the drink's straw and the customer's first sip will taste more potent. Your customer will be convinced the entire drink is stronger, so you will have a happier customer, you won't be screwing your bar over by over-pouring, and just maayyybe receive a little bit better tip. Bonus: if your bottles have a metal pour spout [attachment], they fit directly into a standard drink straw (not a cocktail/sip straw)" (Source).