What was the hardest thing have you ever done?

What I did was no TV for a week that includes video games, computer and internet because it still watching TV to me or no electronics. I didn't know it was for 5 days so I did it for a week instead. While I was doing that, I was reading Harry Potter books. I finished both of them. Now I'm on part 3. Some people can and can't do it. That because everyone have different lives.