Psychology "tricks" are all around us.
They are used in advertisements, in magic, in sports, in social interactions and even at work. People use the social skills and the perceptions we all hold to help influence their environment in a way that is beneficial to themselves or someone else.
Some psychology "tricks" are quite simple: Say someone's name when you meet them and you're more likely to remember it. Others, though, are more intricate and subtle. Below is a list of a few of those, provided to Imgur by the user Youowemealife. Some commenters interpreted them as being evil ways to get what you want, while others argued their actual psychological merit.
Either way, a lot of them look like they'd be worth a try, if for nothing else just fun.