Writing Scenes for Novels

Not long ago I suggested to one of my friends that she should capture any scene the moment it comes to her–whether or not she’s working on that part of the story yet.I’m talking about those snatches of dialogue that seem to come out of nowhere, those words and phrases which describe a background or portray a haunting idea. My experience is that those original bits can never be duplicated. When I try to write them later, they either are stale or that perfectly smithed phrase is suddenly evading me.