Here’s the rules:
1: Post something you have never done that you think many people do. 2: Read the other posts, if you have done that thing, upvote it. If you have not done that thing, downvote it. 3: If you believe the person is lying, call them out on it in a reply. 4: If you are called out, give the full story. 4a: If you see a thread containing the full story, boost the person you think is right and truthful.
Person who has the most upvotes when the thread dies wins.
They mess with your feelings and/or perceptions, to pretty much cover all the bases. Generally, people try them because of peer pressure or curiosity about a potentially interesting experience, and keep using them because they enjoy the experience. Or because of more peer pressure and addiction, in some cases.