The one concept in psychology that I know I will still remember 5 years from now is conformity. According to Lilienfeld, conformity is "the tendency for people to alter their behavior as a result of group pressure." There is always the saying, "don't give into peer pressure," but it is not as easy as it may sound. In high school, there were many times when I saw people fall prey to conformity and did some pretty "dumb" things. I myself have also fallen prey to conformity during high school when I changed my fashion sense to match those of my friends (i.e. growing out hair, following fashion trends). Although we may hate to admit it, conformity plays a role in our decision making even if we don't consciously think about it. Returning back to my high school years, I remember buying clothes that my friends would of have bought not noticing that my fashion sense had change because of the people I was with. I feel like this concept will stick with me for years to come because now it is one that I personally deal with on a daily basis.
This image show an example of a man who refuse to conform with the bigger group. In high school, if you did not conform with the group, you were not "cool." Which may be why I consider high school a time period in my life where I conformed and why I will always remember this concept.