The same holds true with negative things. You are having an ordinary time. Everything is going as per plan. Then all of a sudden disaster strikes: bad news about a friend or family member, you hear that your services are no longer required, you suddenly are given 50 hours worth of work that must be completed and on the boss's desk by 9am tomorrow morning, etc. How quickly an ordinary day turns into a very bad day. We grumble, we rant, we rave about how awful things are; we might even say that we wished that we had stayed in bed. We can easily pass on our negativity to others making their days bad as well. Some people have something traumatic happen to them one day and never rise above the pain that it causes. They want to share their pain with others just so others will feel like they do. Like good news, bad news can be infectious as well.