Whether you're trying to convince a friend where to grab lunch, or trying to sway your boss to your side in a meeting, your odds may be better if they have a little caffeine in their system.
Researchers in Australia ran an experiment in which participants were presented with two opposing sides of several arguments. One group was given a dose of caffeine between hearing the second of the two messages, while a control group only took a placebo. Interestingly, the experimental group was more easily swayed, on average, by the second set of arguments.
A cup of coffee isn't going to guarantee a raise from your boss, but you can still try to time your interactions based on when your conversation partner last visited the break room for a cup of coffee. It might not make a
difference, but it just might be enough to push them over the edge if you present your ideas well.
Effects of caffeine on persuasion and attitude change: The role of secondary tasks in manipulating systematic message processing
| Erowid via