When in a conversation with someone, there are a few types of things that you can say to the other person or people involved that is interesting to them. There are a lot of things you can say that are not interesting to them and therefore will kill the conversation. For example, good things to talk about would be something interesting that you read or saw on the internet, or a funny story that people can relate to.
For some reason, I continuously find myself in the presence of people who don't grasp this. People share stories from work that aren't relatable to anyone that doesn't work there, because they talk about the intricacies of working there or bitch about a manager or something like that. They don't seem to grasp that there is a difference between sharing a funny story that just happened to have happened at work, and sharing a story that is just bitching about your manager.
Another thing people do when they want to start conversation is relay a story that is not really interesting and attempt to make it interesting by reenacting everyone involved in the story's reactions. Like, "The other day, kevin went to subway and got a sandwich, but they put onions on it and he didn't want onions, so he was like "I SAID NO ONIONS!!! AHHHA!""
These types of things are not only boring for everyone involved, but there is nothing to say in reply to them. They elicit no thought, and it's like the speaker doesn't even think if anyone will find this story interesting before they just spew it out of their mouth.