So you're bartending. You're weighing the pressure of not letting your boss think you're pouring too much of his liquor into the customers' beverages while also holding onto your clientele for the evening. Here's the magic process:
A man walks in, it's hot outside, and he wants a light and refreshing drink. You mix up a vodka, soda, splash of lemonade, sprig of mint deliciousness. Keep the liquor pour light, so he doesn't exclaim "Whoa! This is strong!" letting onto your manager.
He enjoyed the light flavor on his palate and knows he's feeling level-headed but just a little more relaxed, so he asks for another. This time, make it just a little stronger. The customer's mind associates it with the first drink, assuming it is of the same strength, even though he can begin to taste that alcoholic burn.
Another customer walks in, and you begin the same process. As relaxation and ease of spirit takes over, conversation starts to flow, and so do more beverages, a little stronger each time (to a limit). Before you know it, you have four or five people who came in for a "one and done," who are enjoying the company, and it turns into a party. They order shots, ask for refills, and your sales for the night are driving up...along with your tip (people tip way better when they've had a great time).
Two days later, after the recovery process, everyone comes back for another "one and done" because the drinks are so light and refreshing...