Why People do Stupid Things

I have always wondered why people do stupid things. Now I think I know. It is for a combination of reasons one of which is a lack of communication. The second is the inability to perceive and understand things from another perspective. The third is that people feel emotions but do not always understand where they come from and misdirect their reactions and their intent. I am writing this because today I punched my roommate of two years. The only other person I have ever hit was my best friend. We were at lunch together and for a reason I don't remember I punched him in the face. I only did that half-heartedly and I did not put my full strength behind it. I have no idea why I did it. He punched me back and then we just stopped. We are still friends. I punched my roommate and I did it with most of my strength. I don't feel that I meant to hurt him but I do feel that I was trying to direct my anger towards something. It shows because I busted his lip up and I really didn't think I was strong enough to draw blood. What made me angry in the first place was I had been showing two funny videos from a website to a friend and my roommate cut off the power strip to my computer. This is where lack of communication and understanding another perspective enters. I know my roommate dislikes my friends coming back with me because they stay for about twenty minutes and we talk. He was studying and I was going to get them to leave after about ten minutes, which was the length of the two videos. My roommate was telling them to leave and watch the video later and I ignored him. I ignored him because I thought he would be smart enough to figure out that because I said "you have to see this one before you leave" to my friends that it would be the last of the two videos I had planned to show. I was wrong and he decided to shut off my power strip. If I had just told him explicitly that this was the second and last one instead of implicitly none of this would have happened because he would not have been forced to drastic measures. This is where understanding another perspective on his part would have helped also. I was tired of people touching my computer without my consent. My roommate earlier this day tried to hit command Q while I was doing an online assignment. He has done this before when I have been playing games and it did not bother me much then and he did not do it often. One of my other friends has a habit of hitting the power strip on my computer while I am playing games. This has occurred more frequently recently and made me angry over time. I would have much rather punched him for being a jerk than my roommate but I misplaced my aggression. I did not realize this until a while after I hit him. I am angry with myself for not stopping this when I saw signs both in myself emotionally and in what my roommate said that could have prevented me from hurting him. I am glad I am not always this emotional or I could do more stupid things. I am sorry I hurt my roommate. That is all I really want to say and for the record I only have a bruised elbow so I hope things get back to normal.