I'm angry about something that happened in the past, so much so that I want to hit something.
Does hitting something usually help?
It's strange but I feel better after hitting something
It's normal to feel strong emotions when sensitive memories come to the surface, but reacting by hitting something often isn't a good idea. In a controlled setting like a gym, it can be cathartic to hit things. However, if you're just impulsively hitting random things whenever you're angry then it may be a good idea to seek out anger management therapy.
Nah, I'm going to smash a computer screen. I only have one screen at home, though.
If you only have one computer screen, then it's important for you not to break it.  I would advise that you take out your anger on a pillow, or go to the gym right away and try a punching bag.  Hitting household objects could not only break them, but it could easily injure your hands as well.